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A Decade of Research on K-12 Teaching and Teacher Learning with Social Media: Insights on the State of the Fieldby Christine Greenhow, Sarah M. Galvin, Diana L. Brandon & Emilia Askari - 2020 Background and Context: The increasingly widespread use of social media to expand one’s social connections is a relatively new but important phenomenon that has implications for teaching, learning, and teachers’ professional knowledge and development in the 21st century. Educational research in this area is expanding, but further investigation is necessary to better determine how to best support teachers in their professional development, collaboration, and classroom teaching. Prior literature reviews have focused extensively on higher education settings or particular platforms or platform types (e.g., Facebook, microblogging). This article provides needed insights into K–12 settings and encompasses work from a variety of social media types. We describe a systematic review of more than a decade of educational research from various countries to present the state of the field in K–12 teachers’ use of social media for teaching and professional learning across various platforms. Research Questions: To define social media’s potentially beneficial roles in teaching and learning, we must first take an in-depth look at teachers’ current social media practices. Toward this end, we approached our review with the following research question: How are social media perceived and used by K–12 teachers for their teaching or professional learning, and with what impacts on teachers’ practices? Research Design: Guided by Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) established standards for rigor and quality in systematic literature reviews, this article reviews empirical research to examine how social media are perceived and used by K–12 teachers with what impacts on teachers’ practices. Findings: We find that social media features offer several benefits for helping teachers fulfill their goals for classroom teaching, including enhancing student engagement, community connections, and teacher–student interactions, but these affordances come with challenges that must be navigated. The literature also suggests that social media features provide benefits for teachers’ professional learning within both formal professional development programs and informal learning networks. Conclusions: Implications of this literature review for future research and the design of educational practices are discussed in the final section. Among our conclusions are calls for more data triangulation between teachers’ and students’ learning and experiences on social media, more attention to teachers’ observational behaviors on social media, and further exploration of how social media facilitates interplay between teachers’ formal and informal learning. Social media and cloud computing are nearly ubiquitous in informal learning settings around the world. Many learners regularly communicate in these spaces to share resources, ideas, and interests. Globally, people are increasingly turning to social media for real-time information and connection in their everyday lives. For instance, approximately 2 1/2 billion people, or one third of the worlds population, are using social network sites across geographical, cultural, and economic borders (Statista, 2017). In fact, social media across platforms, including Facebook, Twitter, Pinterest, and Instagram, find broad engagement and reach in personal, professional, and political domains. It is in this growing social media space that individuals involved in educationpolicy makers, administrators, teachers, students, and parentsmust better understand the impact of social media in order to acknowledge and leverage the resources, information, and people available through global social networks. Through increased understanding, we may be better able to help teachers collaborate with one another to inform and improve their knowledge and classroom teaching. To advance the field of educational research, we must keep up to date about and critically evaluate new perspectives, findings, and methodologies arising from these evolving social phenomena. A variety of educational organizations have documented the widespread use of social media in education (e.g., RAND, 2016); however, research on the educational activities occurring within and around social media and their connection to K12 classroom teaching and school practices is still in its infancy. Educators continue to be interested in exploring social media as a teaching tool and for their own professional learning (Kent & Leaver, 2014), yet many teachers remain uncertain about how to meaningfully integrate this technology or assess its impacts (Crook, 2012). Web-based social networks introduce tools, people, and materials to school culture that could help to break up established routines and assist teachers and students in getting feedback on their performances (Bransford et al., 1999). Leveraging social media capabilities may give teachers and students access to a different culture that helps them clarify their beliefs about teaching with technology and revise their behaviors (Greenhow et al., 2009, 2015). However, online social networks may also frustrate instructional practice when teachers do not see their value or are unable to form and use such networks to advance learning and teaching goals. Existing published literature reviews related to social media in education have focused mainly on learning or teaching with a particular social media type (e.g., social network sites) (Greenhow & Askari, 2017; Rodríguez-Hoyos et al., 2015) or platform, most commonly Facebook (Aydin, 2012; Hew, 2011; Manca & Ranieri, 2013, 2016; Wilson et al., 2012) and Twitter (Alias et al., 2013; Buettner, 2013; Gao et al., 2012; Tang & Hew, 2017). Furthermore, the majority of studies in these reviews focus on the perceptions and experiences of college students (Aydin, 2012; Manca & Ranieri, 2013) and higher education faculty (Forkosh-Baruch & Hershovitz, 2012). Moreover, the benefits of appropriating social media into teaching and learning contexts are contested in the research literature. For instance, some studies on the integration of social network sites such as Facebook in higher education suggest their affordances for interaction, collaboration, information, and resource sharing (Mazman & Usluel, 2010); encouraging participation and critical thinking (Ajjan & Hartshorne, 2008; Mason & Rennie, 2006); and increased peer support and communication about course content and assessment (DiVall & Kirwin, 2012). Others warn against exploiting social media for learning because of its potentially negative impact on student outcomes such as college GPA (Junco & Cotton, 2013; Kirschner & Karpinski, 2010). Currently, no comprehensive statement of the nature of research on social media in K12 teaching or teacher learning and its implications has been produced, providing little guidance to K12 teachers or teacher educators on evidence-based practices. We know that both teachers and students are already using social media (Greenhow & Askari, 2017; Manca & Ranieri, 2016; Tang & Hew, 2017). Therefore, to inform future research, teaching practices and policies for social media use in schools, we focus our attention on understanding what is known about social medias applications in education. This means focusing on the teachers and classrooms where social media has been used and investigated. An in-depth look at teachers current social media practices is the first step toward defining platforms potentially beneficial roles in teaching and learning. What does this scholarship look like? What has been learned? Our interest in these questions inspired an extensive literature review guided by the research question, How are social media perceived and used by K12 teachers for their teaching or professional learning, and with what impacts on teachers practices? Next, we provide an overview of the extant knowledge of teaching and teacher learning with social media in education, beginning with a brief definition and history of social media, followed by the identification of common themes and conceptualizations. Specifically, we summarize teachers competing goals; factors that influence technological innovation in schools, especially access to varied professional learning opportunities; and current research on social media in education. We then describe our methodological approach, including the systematic review procedures used to collect articles and analyze the content of relevant literature. We present our findings, followed by their implications for future research, with specific reference to gaps in the literature. TEACHING AND TEACHER LEARNING WITH SOCIAL MEDIA DEFINITION AND HISTORY OF SOCIAL MEDIA There is general agreement that the first social media site emerged in 1997 with the creation of Sixdegrees.com, which allowed users to (1) create profiles, (2) list a set of other users with whom they shared a connection, and (3) view and traverse others connections (boyd & Ellison, 2007). Although these features existed in various forms independently, Sixdegrees.com was the first to bring them together (boyd & Ellison, 2007). From Six Degrees arose the phenomenon of blogging in the late 1990s and early 2000s on platforms such as LiveJournal and Blogger, which featured the creation and maintenance of web articles posted in reverse chronological order. Around this same time, social media called wikis, used for collaborative web authoring on platforms such as wikispaces, gained in popularity. Before 2001, wikis were virtually unknown outside closed circles of computer programmers. Also around this time, Friendster, considered one of the first social network sites, was growing in prominence, mostly in Asia. Today, there are hundreds of platforms across various types of social media; some of the most prominent include blogs (e.g., Blogger), wikis (e.g., Wikipedia), social network sites (e.g., Facebook), microblogs (e.g., Twitter), photo-sharing services (e.g., Instagram and Pinterest), video-sharing services (e.g., YouTube), products/services review (e.g., Yelp), social bookmarking, and social gaming (Obar & Wildman, 2015). Hallmarks of social media are that they are Web 2.0 Internet-based applications that feature user-generated content, profiles for the site or app created by users, and the development of online social networks by connecting a users profile with those of other individuals or groups within the system (Obar & Wildman, 2015). This last hallmark feature, the facilitation and development of online social networks, is more prominent in some social media types than others: Social network sites such as Facebook spotlight peoples lists of connections and feature the ability to view and traverse the connections of others. Next, we identify central themes and conceptualizations related to K12 teaching, especially teaching with technology, teacher learning, and social media in education that help ground this review. TEACHING WITH TECHNOLOGY Teaching is a complex endeavor that draws on various types of knowledge in shifting, ill-structured environments (Mishra & Koehler, 2006; Spiro et al., 1991). Teachers must adjust their pedagogy based on students diverse needs, curriculum, pedagogy, and assessments and adapt practices to local contexts and coordinate with each other as they do so (Frank et al., 2011, p. 139). Research on teachers motivations highlights their efforts to balance competing goals and beliefs about effective teaching practices with others expectationsfor example, school norms and pressures from outside influences such as professional development (PD) initiatives (Frank et al., 2010). Teachers goals may include building on students prior knowledge and preferences, increasing student engagement, enhancing students self-expression and agency, designing authentic learning environments, facilitating studentstudent and studentteacher interactions to create a classroom community, and other practices shown to support how people learn (Bransford et al., 1999). Moreover, teaching requires knowledge of student thinking and learning (pedagogy), of subject matter (content), and of their intersections (pedagogical content knowledge) or the ways of representing and formulating the subject that make it comprehensible to others (Shulman, 1986, p. 9). Innovationfor example, computers and technology introduced into schoolsadds complexity to this already complex process. Zhao and Frank (2003) compared the introduction of technology in schools to an invasion of an ecosystem by a foreign, [invasive] species (p. 813). Depending on the compatibility between the innovation (invader) and the teacher and the teaching environment, the innovation wins and transforms the status quo; the innovation loses and perishes; or the innovation and teacher co-evolve, influencing each other and developing new properties. Zhao and Frank argued that the teachers adaptations are influenced by the help they receive [or not] and by perceived pressure from others . . . teachers may be reacting to institutions or other forces exogenous to the school (p. 828). Mishra and Koehler (2006) argued that the complex understanding required for teachers to meaningfully integrate technology into classroom teaching necessitates synthesis of their knowledge of content, pedagogy, and technology, or technological pedagogical content knowledge (TPACK). Some studies have shown that classroom teaching with powerful, multifaceted technologies such as the Internet places huge demands on teachers TPACK that some fail to navigate (Wallace, 2004); historically, the promise of computers in schools has not lived up to its potential (Cuban, 2001). TEACHING WITH SOCIAL MEDIA On the other hand, never before have Internet technologies such as social media become so ubiquitous in our lives across home, school, and community boundaries, pushing on metaphors of technology as foreign or familiar in K12 schools. Much of the research to date on teaching with social media has focused on higher education contexts or on teaching with the specific social media platforms such as Facebook (Aydin, 2012; Hew, 2011; Manca & Ranieri, 2013; 2016; Wilson et al., 2012) or Twitter (Alias et al., 2013; Buettner, 2013; Gao et al., 2012; Tang & Hew, 2017). Existing literature reviews emphasize instructors and students attitudes toward using social media in university education (Hew, 2011; Manca & Ranieri, 2013; Tang & Hew, 2017), and instructors use of social media to supplement traditional learning management systems (Manca & Ranieri, 2013). Literature reviews on Facebook as a learning environment have reported instructors use of it largely as a closed, or private, environment; the private group feature is used to post comments and discuss or share resources among students and faculty in the formal classroom space: Facebook seems to be . . . as a fenced space to deliver content and support interactions rather than combine different and heterogeneous sources of instructional materials (Manca & Ranieri, 2013, p. 494). In contrast, conceptions of teaching with social media in the literature emphasize its potential to improve or change traditional practices by (1) opening or widening the context for learning beyond the class to a larger networked public; (2) introducing a hybridization of expertise (e.g., past learners, practicing professionals, other teachers); (3) mixing different types of information and resources; and (4) reshaping teachers roles toward facilitation and constructivist pedagogies (Manca & Ranieri, 2016). Furthermore, because they can blur boundaries between socializing, leisure, and learning, scholars conceive of social media as tools that teachers can use to achieve their goals of fostering relationships (e.g., studentstudent, studentinstructor), active learning, the development of communication skills, and morepotentially leading to increased student engagement and learning outcomes (Nowell, 2014; Siemens & Weller, 2011). TEACHER PROFESSIONAL LEARNING Teachers meaningful integration of technologies such as social media in classrooms is influenced by a complex set of factors, including access to the Internet and technical support; organizational aspects, such as school culture and leadership; individual teacher characteristics, such as her willingness to use technology and pedagogical style; and professional learning opportunities (Frank et al., 2011). While many K12 teachers take part in formal PDfor example, after-school workshops, seminars, courses, or graduate degree programsresearch suggests that professionals spend considerable time per week learning in informal interactions with peers about topics related to their work (Eraut, 2011). In fact, teacher PD that involves peer collaboration is a key factor for student achievement (Moolenaar et al., 2012). Although definitions of formal and informal (and nonformal) learning are varied, often contested in the educational literature, and their interrelationships are complex (Greenhow & Lewin, 2015; Macià & Garcia, 2016), here we refer to formal learning as situations in which some agentsuch as a PD facilitatoris directing the learning. The agent guides the learner (e.g., teacher) through a formalized set of objectives, tied to curricula, and typically generated by an external authority, such as standards developed by professional organizations or mandated by the government (Greenhow & Lewin, 2015). Informal learning is described as learning from experience that is not directed by a school or professional organization or externally mandated but is exploratory, spontaneous (Greenhow & Lewin, 2015) and typically takes place outside formally structured, institutionally sponsored, classroom-based activities (Watkins & Marsick, 1992, p. 288). Sfards (1998) two metaphors for learning are useful in thinking about these distinctions: learning as knowledge acquisition and learning as participation. Teacher learning as knowledge acquisition is evidenced by teachers collecting resources and curricula for teaching (Hu et al., 2018), or acquiring knowledge through active, hands-on PD and opportunities for experimentation (Frank, et al., 2011). Although teachers need to experiment with new technologies and pedagogies introduced in formal professional development to co-evolve, an individual teachers experimentation can be limiting because she lacks the time to acquire all the local knowledge necessary to adapt the innovation to the local context (Frank et al., 2011). In this case, a teachers knowledge can be supported through interactions with people with diverse knowledge. Thus, a second metaphor for teachers professional learning is learning as participation in professional communities and networks (Sfard, 1998). For instance, communities of practice (CoPs) frameworks emphasize teachers collaboration toward a common objective, shared norms, and commitment to learn and develop ideas and resources through sustained participation in a community of practice over time (Wenger et al., 2002). Teacher learning can also occur through participation in informal networks, or the set of relationships, personal interactions, and connections among participants who have reasons to connect (Wenger et al., 2011, p. 9). Such network participation can be short- or long term, spontaneous, and provide individuals with the potential to access people and information resources through their social relationshipswhat sociologists term social capital (Lin, 1999). Understanding these networks is important because how teachers access information or support from other teachers . . . the flows of such resources can improve teachers capacity to teach, innovate, and coordinate with one another (Frank et al., 2018, p. 2). Thus, by participating in informal learning communities and networks, teachers can learn from others in their local contexts who have adapted innovations given similar students and curricular and organizational elements and who have an interest in supporting others (Frank et al., 2011). Furthermore, teacher learning can also be influenced by the knowledge and expertise that teachers tap beyond the school or district through informal interactions within teacher networks on social media. TEACHER PROFESSIONAL LEARNING WITH SOCIAL MEDIA Beyond classroom teaching with social media, educators are logging in to social media for their own professional learning. As Homan (2014) concluded after studying an English teachers use of social media in her PD practices, New technologies are also shaping how the professional networks of teachers are maintained, as these network connections move to online spaces perhaps not commonly considered professional, such as Facebook or Twitter. In the 21st century, what it means to be a teacher is shifting alongside the technological landscape. (p. 327) Teachers are reclaiming their PD and redefining what meaningful teacher learning looks like in our digital world (Galvin & Greenhow, 2020). Macià and Garcia (2016) reviewed the literature for evidence of how teachers have pursued opportunities for professional learning online. They found that informal online communities and networks can provide a source of teacher PD. Practices developed in these communities and networks included sharing experiences and reflecting on practice; posing or answering questions or asking for help; sharing teaching materials and resources; engaging in generic discussion; and offering and receiving emotional support. Prestridge (2017) found that teachers appreciated the ability to participate in online informal networks of other teachers for PD without time or geographic constraints: Online professional development can be considered a mechanism for self-renewal where teachers beliefs and practices become the focus and influence of the design of professional development through self-generating content and self-directed pathways for learning (Prestridge, 2017, p. 100). Despite these accounts of the potential for teachers professional learning online, published literature reviews reveal little about teachers formal or informal professional learning with social media, especially in K12 education (Greenhow & Askari, 2017; Manca & Ranieri, 2013, 2016). The field calls for theory and an evidence base from which to understand and evaluate how teacher professionalism, knowledge, and practice have evolved along with teachers engagement within social media and how such social phenomena could be leveraged to address our most pressing educational problems, such as improving teaching quality and supporting communication and collaboration among educational professionals. Moreover, we have even less evidence about the interchange between online and physical spaces and the impact of those exchanges within K12 classrooms and schools. Next, we describe our methods for carrying out this review, followed by our presentation of findings. METHODS RESEARCH QUESTION AND STUDY DESIGN The following question guides our review: How are social media perceived and used by K12 teachers for their teaching or professional learning, and with what impacts on teachers practices? To answer this question, we analyzed the contents of educational research articles published in peer-reviewed journals during the 13-year period from 2004 to 2017. We chose this time frame because social media rose to mainstream prominence in 2004 (boyd & Ellison, 2007), and research typically takes a few years to catch up with societal phenomena. Furthermore, unlike prior reviews of the educational research literature that have focused on a specific social media platform, such as Facebook or Twitter, our review synthesized research across several platforms; however, we excluded research on some early social media types (e.g., blogs and wikis) because these technologies have been in use since the late 1990s and early 2000s. Existing literature reviews (García-Martin & García-Sánchez, 2015; Hew & Cheung, 2013; Minocha, 2009) either partially or solely address these platforms. Reich et al. (2012) and Stewart (2015) have already addressed the use of these platforms in K12 teaching, and Hew and Cheng (2013) addressed both K12 and higher education. In addition, we sought to focus our review on social media types that prioritize the development of social networks, such as in social network sites, photo- and video-sharing services, and other types of social media that spotlight peoples lists of connections and the ability to view and traverse others connections in the systemaffordances that have been underexplored in literature reviews to date. Because we sought to understand the educational benefits and challenges of social media spaces with these features in a deep rather than cursory way, we narrowed the scope of our review to focus on these social media types. The methodology for this literature review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) standards, which emphasize transparent and detailed reporting of search procedures (Moher et al., 2009). These procedures include (1) identification and (2) screening of records, (3) assessing articles for eligibility, and (4) determining whether a given study is to be included in or excluded from the sample based on inclusion and exclusion criteria (see Figure 1 for the PRISMA flow diagram for this review). Informed by our overview of the existing literature, we sought to identify studies that addressed K12 teaching or teacher learning or PD with social media across the globe. Our search and identification of records occurred in two phases. In the first phase, we concentrated on identifying studies from electronic databases. With the assistance of a library science expert, we identified four prominent databases for educational research: Education Full Text, ERIC, Scopus, and Web of Science. The selection of these databases was considered sufficient and reasonable given that they are prominent reference sources for education and social sciences research. To address our research questions, we performed searches using the following initial search terms: (K-12 Teaching OR teacher training OR professional development OR elementary school or middle school or high school) AND (social media or social network sites or social networking sites or Facebook or Twitter or microblogging or Pinterest or Instagram) NOT (higher education). These were the initial search terms for each database. Based on the relevancy of results in each database, search terms were revised to target various types of social media individually. During these searches, results included only peer-reviewed publications in English and within the 13-year period from 2004 to 2017. This initial phase of the search resulted in 1,253 documents. In the second phase of the search, we conducted a variety of hand searches. First, we reviewed lists of journals dedicated mostly or entirely to the topic (i.e., educational research journals, educational technology journals, and technology-enhanced learning journals). (See the Appendix for a full list of journals.) To surface any relevant articles in journals not covered in the database search, we conducted a manual table of contents search for each journal for the years available: Journal of Literacy and Technology (20072017); Journal of Educational Technology Development and Exchange (20112017); and International Journal of Online Pedagogy and Course Design (20112017). Two journals not covered in the database search but that appeared on our list of relevant journals were unavailable through our university library system and therefore excluded: International Journal of Continuing Education and Lifelong Learning and International Journal of Technology in Teaching and Learning. Second, we created a snowball sample from the cited references in all the literature reviews that appeared in our search and from the cited references of any literature reviews, empirical articles, conference proceedings, books, or other publications from our own personal collections. Citation entries were reviewed by title and abstract to determine initial relevance. Third, we analyzed the database search results and identified all journals with more than five relevant entries: Australasian Journal of Educational Technology, British Journal of Educational Technology, Computers and Education, Contemporary Issues in Technology and Teacher Education, Cyberpsychology Behavior and Social Networking, Educational Media International, International Review of Research in Open and Distributed Learning, Journal of Adolescent & Adult Literacy, Journal of Teacher Education, Teaching & Teacher Education, and TechTrends. For each of these journals, we then did a manual table of contents search on our focal topic for the years 20042017 to ensure that we did not miss potentially relevant articles. Fourth, we contacted authors in the field whose articles appeared relevant on our initial screening of records or who we knew to be working in our focal area; we requested articles from them, or from others they knew, that might be relevant. Together, these four hand searches in the second phase of the overall search surfaced 60 additional documents. From this combination of searches, we removed 30 duplicate records, leaving a total of 1,290 records for screening. Screening occurred based on title and abstract review. To remain in our pool, articles had to include social media use by K12 teachers. They had to be empirical and published in English in peer-reviewed journals. Non-peer-reviewed reports, book chapters, conceptual pieces, unpublished dissertations, conference papers, or masters theses were excluded. During this screening, 1,191 articles were excluded, leaving a total of 92 studies. The references of these articles were also checked for any potentially relevant articles not identified in previous search procedures. This step resulted in an additional seven articles, bringing the total number of identified articles to that underwent a full review to 99. Final screening of the 99 studies included a full-text review of each article by two authors who assessed its eligibility. These articles were screened for inclusion by the two author-reviewers and marked as relevant or irrelevant with a written rationale. Any discrepancies were resolved by a third rater. Interrater reliability was calculated at 98%. From this rating process, 41 articles were excluded. These articles were excluded for one of three reasons: The social media platform in the article was outside the parameters of our review (e.g., blogs, wikis, collaboration tools, file sharing tools); the quality of the research was insufficient or not sufficiently described to judge its quality (e.g., the article lacked a methods section, data sources were not identified, data analysis procedures were not described); or the focus was not on teachers (e.g., the study focused on students or school administrators). Thus, the final sample included 58 studies for qualitative analysis. The process of collecting articles according the PRISMA standards is depicted in Figure 1. Figure 1. PRISMA flow chart
DATA ANALYSIS Once the pool of 58 relevant research studies was identified and included in the final sample, the two author-reviewers read each article again, in subsets of 1015 articles at a time, and each used a spreadsheet template that included various categories of basic article information, such as citation, abstract, keywords, author, journal, year, and so forth. These spreadsheets also contained a priori categories derived from our prior reading of the literature, which assisted in the development of quantitative descriptions and provided starting points for broader thematic analyses and writing (Yin, 2009). Such a priori categories included country of study, theoretical frameworks, sample description, methodological approach, grade level and course subject focus, social media used, and summary findings. To understand our samples characteristics, we created a table (see Table 1) that presents descriptive statistics for the sample, including the year the study was published, social media platform and features used (open/public or closed/private), and teachers subject matter and grade level.
Note. PD = professional development In addition to a priori code categories, our coding process involved reading for additional emergent, descriptive codes, following an iterative process informed by two independent coders (Glesne, 2016; Saldaña, 2016). The two coders reviewed 310 studies at a time, taking independent notes on the a priori categories and other memos of interesting features, details, or findings from each study, including those that did not fit in (or were extensions of) the predefined codes (e.g., unique implications for policy or teacher education were discussed). Then, the coders met to review notes and discuss each study. From these conversations, new codes and patterns emerged, and additional sections were added to or revised within our coding spreadsheet (e.g., sections to record notes on policy and teacher education were added so that these themes could be tracked across the data set). Coders continually reviewed and revisited previously coded articles as new codes were generated. For example, when coding for methodology, we realized that while indicating qualitative, quantitative, and mixed methods was helpful, there seemed to be other trends in data collection worth noting. We added categories for marking each studys methods (e.g., use of surveys, interviews, focus groups, social media post content analysis, analytics). This uncovered patterns in most-used methods (discussed in the Results section) and drew our attention to another category that we later integrated: quantification of impact (on teaching or learning). Additionally, some changes to our coding spreadsheet occurred to increase the clarity of our data. During our initial coding of sample size, for instance, we needed to reconsider what level of detail to include. Some studies cited the number of individuals posting to a social media platform, whereas others indicated sample by total number of social media posts without tracking individual posters. These became important distinctions when comparing studies focused on thousands of individual posts (e.g., Greenhalgh & Koehler, 2017) to studies focused on the experiences of a few case study participants (e.g., Lindstrom & Niederhauser, 2016). To maintain transparency, each coder worked with her own copy of the spreadsheet template and points of initial disagreement and the resolution were noted and preserved within our spreadsheets. The final version of our spreadsheet categories addressed the following: article quality, research questions, theoretical framework, methodology description (also broken into qualitative, quantitative, mixed methodologies, and types of data collectionsurvey, interview, focus group, post content analysis, analytics, use of control groups), participant type (e.g., grade level, teachers vs. students) and number, location, PD (formal or informal) or classroom setting, social media used (open or closed), time span, overall theme (including a generally positive or negative view of social media), impacts quantified, scalability, and categories for open-ended notes on policy, research, teaching, teacher education, and miscellaneous points of interest. RESULTS In response to our research questionHow are social media perceived and used by K12 teachers for their teaching or professional learning, and with what impacts on teachers practices?our findings relate to our studys two focal areas: common themes in teaching with social media and in teachers professional learning and development. Next, we first present the results of our descriptive analysis and then our emergent findings. DESCRIPTIVE ANALYSIS RESULTS Among the articles in our literature review, the majority of articles (N = 44), or 76% of the sample, covered teachers social media use in various forms of professional learning (see Table 1). Just 14 studies were categorized as studies that addressed teaching with social media in K12 settings. As shown in Table 2, in looking at the distribution of studies across the years surveyed (20042017), more studies were published in 2017 and 2016 than in any other years. Moreover, almost all studies (N = 54) were published between 2013 and 2017.
In examining the geographical distribution of studies, we found that research on teachers use of social media is occurring around the globe. About a third of the studies (N = 20, 34%) had a participant population categorized as global (i.e., they included a population of participants not limited to a particular geographical location). It is important to note, however, that these studies varied in the extent of their global reach (i.e., studies marked as global incorporated samples distributed across multiple countries to varying degrees). That is, the openness of social media facilitated the selection of participants from beyond the researchers locale, but, as might be expected, the network of connections from which these broader samples were collected still sprung from one geographical place or context (e.g., the country from which the researchers were working or the country from which the educational context of the study was most relevant); therefore, the populations studied were still often skewed toward one or a few countries as the point(s) of origin. For example, Greenhalgh and Koehlers (2017) study of #educattentats on Twitter after a terrorist attack in Paris was global in that the Twitter chat was open to and did recruit contributors from around the globe; however, the vast majority of participants were from France and neighboring countries such as Germany, which were most impacted by the tragedy. Similarly, other studies examined teachers in groups on open platforms that were available to a global community, but the primary language used or the country from which the group originated localized the types of participants most often engaging in those spacesfor example, Macià and Garcias (2016) focus on Spanish-speaking teachers on Twitter, or Ranieri and colleagues (2012) focus on Italian-speaking teachers on Facebook. Regardless of this, some studies still reported samples with global diversity beyond a few countries. Trust (2016), for instance, reported a sample with participants from nine countries, in addition to the majority coming from the United States; Carpenter and Justice (2018) reported a sample with participants from 12 countries, in addition to the majority coming from the United States and Canada. For our purposes, studies considered global were all those that accessed the affordance of social media to be open to global communities and international participants because the exact extent to which the populations of studies were internationally based was often unclear and could not be effectively evaluated in comparison to others. Within the remaining 38 articles, 17 different countries were represented. See Figure 2 for a summary of the locations represented. The majority of studies in this group were carried out in North America (N = 18, 31%)United States, Canada, and Saint Vincent and the Grenadines; followed by Europe (N = 8, 14%)United Kingdom, Germany, Greece, Finland, the Netherlands and Spain; the Middle East (N = 7, 12%)Israel, Cyprus, and Turkey; Asia (N = 4, 7%)China, Malaysia, Russia, and Taiwan; and, finally, one study occurred in Australia. The three countries most represented in our data were the United States (N = 15, 26%), Israel (N = 5, 9%), and the United Kingdom (N = 3, 5%). Figure 2. Geographic location of reviewed studies
In examining the subject matter focus and grade level of K12 teachers in our reviewed studies, we found that the majority of articles (N = 35, 60%) studied teachers from multiple subject areas. Few articles focused on a single subject. Of the 23 articles set in specific subjects, six (10%) took place in English and reading courses, five (9%) took place in science classes, four (7%) took place in math, four (7%) took place in foreign language classes, and two (3%) took place in social studies, with one study focusing on physical education and one on religion. Similar to the distribution of articles across subject areas, the majority of articles, 34 (59%), looked at teachers from varying grade levels. Of the 24 articles that looked at specific grade levels, high school was the most frequently studied context, represented in 13 (22%) studies. Four studies (7%) gathered data from teachers in both high school and middle school settings, and three studies (5%) focused just on middle school. One article studied middle and elementary school contexts, and three studies (5%) were set in elementary schools. As we considered the types of social media used by K12 teachers across the various aforementioned types included in our review, we found that social network sites and microblogs were the dominant types of social media studied in our sample. For instance, 12 articles (21%) examined teachers uses of the social network site Facebook, and an additional six articles (10%) examined Edmodo, a social network site geared toward education. Seventeen articles (29%) focused on K12 teachers use of the microblog Twitter. Other single-platform studies covered YouTube (Blonder et al., 2013), Ning (Lindstrom & Niederhauser, 2016), Voxer (Carpenter & Green, 2017), and the Online Professional Development Platform (Zhang et al., 2017). The remaining articles (N = 18, 31%) investigated teachers social media use across multiple platforms or generally without specifying a particular type. To summarize, the results of our descriptive analysis reveal that research on K12 teaching or teacher learning with social media is on the rise, with the majority of studies conducted within the last five years of our review period and covering mainly teachers professional learning. The reviewed studies address populations around the globe, with a third conducted in North America. Various subject matters were represented (e.g., English, science, math, and language learning), primarily at the high school level. Twitter and Facebook were the most studied single platforms. <B>EMERGENT FINDINGS In this review, as we inquired into the question, How are social media perceived and used by K12 teachers for their teaching or professional learning, and with what impacts on teachers practices?, we were interested both in how this research was conducted (e.g., methodologies, subjects, frameworks) and in what the results were. Thus, in this section, we report emergent findings with respect to (1) research methodologies represented in our sample; (2) characteristics of research subjects; (3) theoretical frameworks; (4) social media platform capabilities used by K12 teachers for various purposes; (5) themes related to K12 classroom teaching with social media; and (6) themes in teachers professional learning with social media. Table 2 presents a categorization of reviewed studies by methodology. Table 3 provides a charting of all studies, including the author and year of the study; whether it concerned classroom teaching, formal or informal PD, or a combination; research focus and questions; theoretical framework; methods, data collection, and sample; and findings. Next, we present emergent themes in each of the six mentioned areas.
Note. *Data collection coded for the following categories: use of survey, interview, focus groups, post content analysis, analytics, and control-treatment design. PD = professional development; TPACK = technological pedagogical content knowledge; PLN = professional learning network; community of practice = CoP; ICT = information and communication technology. Research Methodologies Mixed-methods designs were most commonly used (N = 26, 43%) in our sample. Qualitative studies were the next most frequent research designs (N = 21, 36%), and quantitative designs were found in only 11 articles (21%). (See Table 2.) Looking more closely at the types of methods employed, surveys and interviews paired with content analysis of social media posts were the most prevalent approaches. For instance, 31 articles (53%) used either surveys alone (N = 17) or surveys combined with other methods of data collection (N = 14). Twenty-eight articles (48%) incorporated interviews into at least part of their data collection, and half (48%) included social media post content analysis in at least some part of their data collection. Thirteen articles (22%) drew findings solely from interviews and analysis of social media posts. The remaining lesser used methods identified from the sample were social media analytics, focus groups, and student test score analysis. Analytics were most used in combination with other forms of data collection; only three articles (5%) relied solely on social media analytics, but a total of 10 articles (17%) used either analytics alone or paired with other methods. Focus groups were present in three articles (5%), two of which (3%) also included survey and interview data. Student test data served as the sole form of data collection in one article (2%); Van Vooren and Bess (2013) used control and treatment groups to investigate whether the implementation of Twitter reminders from the teacher and sent to eighth-grade students in a science class would be related to their level of success on standardized tests. Research Subjects and Sample Size The majority of studies focused solely on data directly from teachers (52 out of 58 articles), with all but two sample sizes ranging from 1 to 1,107 participants. Two outlying articles collected more extensive samples using tweets: Rehm and Notten (2016) studied 4,196 unique Twitter users of the #edchatde hashtag, and Rosenberg et al. (2016) studied 69,552 unique Twitter users of the #educattentats hashtag. Although the main focus of this review was on K12 teachers, three articles (5%) included students, in addition to teachers, in their samples (Forkosh-Baruch et al., 2015; Thibaut, 2015; Vazquez-Cano, 2012). Additionally, three studies (5%) identified unique social media posts rather than individual people (Cinkara & Arslan, 2017; Greenhalgh & Koehler, 2017; Kelly & Antonio, 2016). Theoretical Frameworks Participatory, constructivist, and social learning frameworks were the most widely applied frameworks across the sample. Fourteen articles (24%) adopted these theoretical perspectives. The second most frequently used frameworks were professional learning networks (PLNs) and communities of practice (CoPs). PLNs as the only informing theory appeared in five articles (9%), and when including articles that paired PLNs with other underpinnings, PLNs were used in a total of eight articles (14%). CoP as the only informing theory also appeared in five articles (9%), and when including those that paired CoPs with other underpinnings, CoPs were also used in a total of nine articles (16%). Other theories referenced less frequently were social capital, TPACK, self-efficacy, digital literacies, social network analysis, and affinity spaces. Social capital perspectives were applied in four articles (7%). TPACK, in combination with self-efficacy (two articles, 3%) and authentic learning (one article, 2%), was found in a total of three articles (5%). In addition to its use with TPACK, self-efficacy was applied in three articles (5%). Digital literacy underpinnings were similarly found in a total of three articles. Social network analysis (SNA) was used as the only informing theory of network structure in one article (2%) and paired with an additional theory in a second article. Similarly, affinity spaces appeared as the sole framework in one article (2%) and paired with another theory in one additional articleits overall usage also totaling two articles (3%). The 18 remaining studies (31%) reviewed covered a range of other frameworks not seen in more than one article, including conceptualizations of identity (Robson, 2017), cultural historical activity theory (Trust, 2016), global citizenship (Carpenter & Justice, 2018), and self-regulated learning (Matzat & Vrieling, 2016). Social Media Affordances Used by Teachers for Various Purposes Across the reviewed studies, different platforms were used for their various capabilities (see Table 1). For instance, as mentioned in our literature review, open capabilities can widen the context for learning, facilitating more connections to people and content than is otherwise possible within a particular course or classroom. Comparatively, closed capabilities of social media allow the fencing off or bounding of connections; users often need permissions to find or view other users or content. Our findings suggest that teachers use social media along a continuum of open and closed capabilities that resists simple dichotomies. In the sections that follow, we highlight the affordances of social media used by K12 teachers for various purposes. Open social media contexts for informal professional learning. The largest group of reviewed studies (25 articles, 43%) focused on the open capabilities of social media. Studies in this category covered Twitter extensively (15 articles, 26%), but also included articles on Facebook (five articles, 9%), Edmodo (four articles, 7%), and other platforms that host teacher-centered communities (i.e., WeTheTeachers, Teacher Focus, and LiveJournals teacher community; one article, 2%). None of the articles was set in the K12 classroom; all emphasized the teachers perspectives on informal PD, with a few also interviewing or surveying teachers about their opinions on classroom use. Accessing social media to share resources and connect with communities of practice were common themes. For example, in Noble and colleagues (2016) study, four social studies teachers shared how Twitter helped them make connections with other teachers beyond their school building, reflect on their own practice, and build their confidence in the classroom. Of note were the seven articles (12%) covering specific Twitter hashtags (e.g., #edchat). Twitters general dominance in teachers informal professional learning may be reflective of its more public nature, emphasis on brief but extensive exposure to content, and ease of finding teachers with similar interests through the use of hashtags. Teachers are using Twitter to build far-reaching connections and explore new content (organized by hashtags). For instance, after the terrorist attacks in Paris in November 2015, Greenhalgh and Koehler (2017) traced how teachers in France and beyond accessed the Twitter hashtag #educattentats to find just-in-time support and resources for addressing the tragedy in their class discussions. Closed social media environments in formal education. As mentioned earlier, teachers must balance the practices they believe are effective in their own classrooms (i.e., efficacy), with adopting norms to fit into their school (i.e., conformity), with external influences such as the introduction of innovation such as new technologies. Fourteen studies emphasized social medias closed capabilities. With closed or private social media spaces, teachers created supplementary learning spaces for students, while still protecting or limiting their exposure to external others and content outside of the class. Students grouped in a particular classroom (six articles, 10%) or teachers participating in a particular formal PD (seven articles, 12%) joined a closed social media space to collaborate and learn together within the bounds of their immediate peers. For example, Lindstrom and Niederhauser (2016) explored how three fifth-grade girls used digital literacies as part of their participation on Ning in class. Similarly, in Blonder and Raps (2017) study of teachers use of Facebook in high school chemistry classrooms, the PD provided to the teachers emphasized using Facebook to create closed classroom groups. All formal PD studies identified in this review embraced closed social media. Closed social media not only afford bounding a social group, but also provide safeguarding of users privacy. This is of particular concern for underage students accessing the Internet and for defining the types of online relationships between teachers and students. A small subset of studies (four studies, 7%) addressed this issue and investigated types of connections between teachers and students on Facebook (Asterhan & Rosenberg, 2015; Forkosh-Baruch et al., 2015; Kuo et al., 2017; Sumuer et al., 2014). Set in Israeli schools, where teachers are prohibited from contacting students on Facebook, Asterhan and Rosenberg (2015) found that teachers frequently communicated with students on the Facebook platform and developed strategies for balancing privacy and authority concerns with getting to know their students. The research indicates that teachers and students find value in online connections and are actively building relationships in these spaces; however, both teachers and students also express concerns and some reluctance to withdraw from traditionally clear personal and schoollife boundaries (Kuo et al., 2017; Sumuer et al., 2014). New terrain: The intersection of open and closed social media. While a portion (12 studies, 21%) did cover multiple platforms or spanned open and closed spaces, research investigating teachers use of social media at the intersection of open and closed affordances is rare. Only three studies fell in this category; each focused on different platforms and showcased teachers exploring both closed and open capabilities of social media (Carpenter & Green, 2017; Homan 2014; Vázquez-Cano, 2012). For instance, Carpenter and Green (2017) explored how teachers used a mobile instant messaging platform, Voxer. They discovered that although the social media itself favored closed qualities (i.e., small-group private chats in which members can share documents, voice memos, and other resources), 85.8% of teachers reported using it to connect with educators outside their state, and 72.5% reported using it to connect with educators outside their district (compared with the 25.4% who reported using Voxer to connect with others at their school). In Vázquez-Canos (2012) study, teachers again blended open and closed affordances, this time in the context of Twitter. Three Spanish high schools participated in an experimental study to see if implementing Twitter as part of students Spanish language, social sciences, and natural sciences classes improved their national standardized reading and writing test scores, and findings indicated that scores were significantly higher with the implementation of Twitter. Although the specific levels of openness employed were not clarified (e.g., which, if any, hashtags were used? To what extent did students engage with others outside their immediate classroom peers?), the interactive nature of the Twitter assignments described in the article suggests that students were engaging in content-based conversation in Twitters public spaces (i.e., collaborative poetry, stories, or shared-histories and discussion-based prompts). The third study that showcased a teachers exploration of both closed and open capabilities of social media was an ethnographic examining the digital life of one teacher, Sylvia (Homan, 2014). This study was unique in that although the focus was not on how Sylvia used one specific social media platform in ways that blended open and closed affordances, the research did illuminate how Sylvias digital identity balanced both ends of the spectrum across platforms. For example, Sylvia wrote a public blog and participated on Twitter, but she also used closed affordances on Facebook to limit her exposure to students until after they graduated. Homan (2014) described how Sylvias personal and digital lives melded into one; the distance between online and physical spaces seemed to collapse, and Sylvia found that social media changed the types of interactions she was able to have with her students. Instead of teacher-as-authority communications, she had more side-by-side conversations that reshaped students learning processes. Other studies that addressed multiple platforms almost exclusively used survey methods aimed at gathering general-use data. We found few in-depth qualitative studies that examine how and for what purposes open and closed affordances become embedded in teachers practices. In summary, the literature suggests that the closed capabilities of social media are most used in the K12 classroom, whereas the open, public nature of social media is most used for teachers informal professional learning. The points of intersection between open and closed social media affordances and how they might function effectively in PD or classroom settings remain underexplored. K12 Teaching With Social Media Interestingly, we found that the majority (N = 44) of the 58 reviewed studies focused on teachers professional learning and development. Only 14 studies looked at K12 teaching with social media from the teachers perspective. (See Table 3 for an overview of the reviewed studies.) Of the 14 studies categorized as classroom based, only five focused on a particular lesson or learning activity (Bartow, 2014; Lindstrom & Niederhauser, 2016; Thibaut, 2015; Van Vorren & Bess, 2013; Veira et al., 2014), and six considered teachers social media implementation more broadly through general survey or interview approaches (Carpenter & Justice, 2018; Matzat & Vrieling, 2016; Pan & Franklin, 2011; Schwarz & Caduri, 2016; Vázquez-Cano, 2012; Vivitsou et al., 2014). Three studies were not directly tied to classroom instruction, but instead investigated teacherstudent relationships on social media (see the section that follows, which is dedicated to teacherstudent interactions). Most studies focus on older students or surveyed teachers across grade levels. Only two of the 11 classroom studies focused on elementary learners (Lindstrom & Niederhauser, 2016; Thibaut, 2015). Similarly, the majority of the articles include various subject areas (seven studies); two studies were set in science classrooms (Van Vorren & Bess, 2013; Veira et al., 2014), and two in English or language classrooms (Lindstrom & Niederhauser, 2016; Vivitsou et al., 2014). In the following sections, we describe themes in what teachers perceive as the benefits and challenges of implementing social media in their classrooms and the role of social media in teacherstudent relationships. Finally, we comment on the lack of attention in the research base to K12 classroom teaching with social media and their impacts on student learning. Benefits in classroom implementation. The benefits of bringing social media into the classroom resonated across the studies, echoing themes of connectedness and engagement. As mentioned in our introduction, a common goal of teachers is facilitating a connected and engaging learning environment; using social media, teachers were able to facilitate students relationship building not only with local classmates (Lindstrom & Niederhauser, 2016; Schwarz & Caduri, 2016), but also with global peers (Carpenter & Justice, 2018). Carpenter and Justice (2018) surveyed 516 teachers from 14 countries participating in an international social-media-based teaching effort called the Global Read Aloud (GRA). The goal of the program was to help teach global readiness; Carpenter and Justice adopted Kerkhoff s (2017) definition of global readiness as global citizenship with the multiliteracies necessary in the 21st century to participate, collaborate, and work in a global society (Carpenter & Justice, 2018, p. 66). The use of social media such as Facebook and Edmodo facilitated the success of the GRA by allowing teachers to connect with classrooms that would otherwise be outside their reach and expand students perception of community. Social media were used to break down the isolation of classroom walls and situate students learning within wider social contexts.
Challenges to classroom implementation. As noted in the opening to this article, multiple factors influence the integration of innovation (i.e., technology) into the school ecosystem (Zhao & Frank, 2003). Although none of the 11 classroom studies warned against implementing social media in the K12 classroom, five studies noted important challenges that teachers faced when they tried to integrate platforms meaningfully into lessons. Teachers faced barriers from outside of their classroom, stemming from lack of supportive policy, or school administrators and curriculum restrictions (Bartow, 2014; Carpenter & Justice, 2018). Additionally, teachers must refine new pedagogical strategies for navigating the new learning spaces created by social media. For example, in Lindstrom and Niederhauser (2016), the teachers only retrospectively recognized the essential literacy and identity work woven into students profile creation on Ning. They also reflected on the importance of modeling formal versus informal language expectations for students before embarking on future projects asking students to compose profiles for formal learning in an informal space. Teachers also had concerns about the time and effort it took to implement social media (Bartow, 2014; Veira et al., 2014). Mastering new tools and committing to managing and assessing learning in complex spaces can easily be overwhelming and discouraging. Pan and Franklins (2011) survey of 559 teachers summarized the sentiments echoed across our reviewed studies: Professional development, self-efficacy, and support from school administration were all predictors of teachers use of social media with their students. Teachers need to be prepared, feel prepared, and have reassurance from their school and local policy that social media is a learning tool worth investing time and effort in using. Teacherstudent interactions. One goal of effective teachers is encouraging teacherstudent interactions and getting to know students as individuals (Bransford et al., 1999). Of the 14 studies exploring teaching with social media, three emphasized defining and managing teacherstudent interactions in digital spheres. Israel was the setting for two of these studies, reflecting the fact that Israel has attempted strong central-government regulation of teacher use of social media. For instance, Asterhan and Rosenberg (2015) examined the Facebook interactions of students and teachers in Israel, where, at the time data were collected (JuneOctober 2012), the government officially prohibited studentteacher interaction on social media. Nevertheless, of 178 teachers surveyed, 70% were active Facebook users; of those, 54% responded that they had past or current connections on Facebook with students (Asterhan & Rosenberg, 2015). Although the majority of teachers surveyed (62%) suggested that teachers avoid friending students on Facebook, 38% encouraged this practice (Asterhan & Rosenberg, 2015). Teacher survey responses were supplemented by interviews with 11 teachers who had been using social media to communicate with students for at least one year. Teachers motivations for interacting with their students via social media included monitoring and getting to know the students world better (20.72%), improving personal relationships with students (12.42%), improving teachers status (11.90%), academic (learning) purposes (18.57%), and management and organization (12.71%) (Asterhan & Rosenberg, 2015, p. 137). The authors grouped concerns related to teachers use of Facebook with students into three categories according to the type of boundary that can be blurred when teachers and students interact on social media: privacy boundaries, authority/friendship boundaries, and availability/responsibility boundaries. Another Israel-based study on teacherstudent interactions (Forkosh-Baruch et al., 2015) surveyed 160 teachers and 587 students in middle and high school. This study explored the characteristics of teachers and students who are willing to connect via Facebook in comparison with those who are not. Forkosh-Baruch et al. (2015) used Likert-scale questions adapted from the Teacher-Student Relationship Inventory, a tool created to measure teachers assessments of their relationships with students. Forkosh-Baruch et al. (2015) found that generally, teachers who are open to interacting with students on Facebook tend to be younger, newer to the profession, and more experienced on Facebook than are teachers who are less enthusiastic about Facebook as a medium for connecting with students. Transaction costs may be higher for teachers new to the technology or for veteran teachers in school contexts resistant to social media or with more to lose if things go wrong (Frank et al., 2010). Further, Forkosh-Baruch et al. (2015) found that students open to connecting with teachers on Facebook tend to be older, with higher numbers of Facebook friends than their peers. Students willing to connect with teachers on Facebook also are more likely to be male. Among both teachers and students comfortable with teacherstudent Facebook interaction, there is a tendency to view social media as a potential tool for learning and a preference that schools stop restricting use of social media in classrooms. Overall, Forkosh-Baruch et al. (2015) concluded that teacherstudent relationships are more complex in digital spaces than they are in face-to-face contexts. Kuo et al. (2017) also examined teacherstudent relationships on social media; they surveyed 435 secondary teachers in Taiwan about their willingness to accept friend requests on Facebook from a range of people associated with their work, including fellow educators, students in a class the teacher is teaching, students in the teachers current homeroom, other students known to the teacher, and students with whom the teacher had no prior relationship. The researchers found that male teachers were more likely to friend colleagues, students who are unknown to the teacher, and current homeroom students. The identity of the friend requester also was an important factor in the teachers decision to connect with the requester or not. Teachers were most likely to respond positively to friend requests from coworkers outside of school administration. Teachers were least likely to accept friend requests from unknown students. Kuo et al. (2017) explored teacher responses to questions about privacy and ethical boundaries and found that privacy concerns were widely expressed by teachers, but their use of privacy controls in Facebook was not universal. Teachers reported more use of such controls when connecting on Facebook with students whom the teachers did not know, students in their current classes, and administrators. Impacts on students learning. Only two studies in this review focused on attempting to measure the impact of K12 teachers use of social media in their classrooms on student learning. Van Vooren and Bess (2013) evaluated the impact of reminder tweets from teachers on the performance of 86 U.S. students, as measured by their scores on homework and tests. In a control classroom, teachers employed more traditional reminding techniques, such as writing on the board and giving spoken reminders. They found that the teachers reminder tweets were effective in increasing student performance. Vázquez-Cano (2012) attempted to capture the impact of teachers social media use on student learning by surveying 280 students and 15 teachers in Spain about their social media use related to learning. They found that students who reported more engagement with social media in educational contexts tended to score higher in reading and writing on Spains national assessment test than their peers who were less engaged with social media for learning. Teacher Professional Development With Social Media The vast majority of articles (N = 44, 76%) covered teachers social media use for professional learning: formal and informal. As mentioned earlier, formal PD includes structured, official development opportunities, such as classes or trainings offered through schools, districts, or other professional organizations. Informal PD encompasses teachers self-directed learning activities typically outside a class, course, or workshop. Twitter chats and Facebook groups are two examples of voluntary, additional learning activities that teachers access. Only seven articles (12%) discussed social media as a part of formal PD (Bicen & Uzunboylu, 2013; Blonder et al., 2013; Blonder & Rap, 2017; Goodyear et al., 2014; Jimoyiannis et al., 2013; Wang et al., 2014; Zhang et al., 2017), while 33 articles (57%) studied social media as part of informal PD. We focus on trends in both groups of studies next. Formal learning with social media: Aims and impacts. The aim of the majority of formal PD opportunities studied was to improve teachers technology integration in their classrooms (Bicen & Uzunboylu, 2013; Blonder et al., 2013; Blonder & Rap, 2017; Jimoyiannis et al., 2013; Wang et al., 2014). Both platform-specific and content-specific trainings were studiedthat is, Facebook (Bicen & Uzunboylu, 2013); YouTube in chemistry (Blonder et al., 2013); Facebook in chemistry (Blonder & Rap, 2017); and middle school science (Wang et al., 2014)as were general Web 2.0 trainings (Jimoyiannis et al., 2013). Courses not focused on social media integration generally or content-specific technology integration used the technology as part of the teachers formal learning experience (Goodyear et al., 2014; Zhang et al., 2017). In these studies, social media played a positive role in the formal PD course, but this role was emergent rather than engineered. For instance, in the Goodyear et al. study (2014), the PD facilitators had not planned to use social media to support teachers in making pedagogical changes, but they found, through the course of their two-year study, that Facebook and Twitter were spaces outside the school building where they could offer participating teachers moral support, encouragement, and additional resources. Furthermore, teachers began engaging with each other through social media, sharing resources and affirmations of classroom efforts. In reviewing the literature, we identified that there was a lack of underlying pedagogy for PD. An exception was Jimoyiannis and colleagues study (2013), which articulated a design-based learning approach in which teachers created materials for their classrooms; most studies depicted PD broadly in terms of the number of hours or sessions involved, with few details about the course design. These formal PD efforts were not typically tied to national or international reform initiatives or standards, except one effort that was tied to Common Core Standards (Wang et al., 2014) and a second, led by the Web 2.0 European Resource Centre supported by the European Union, that trained teachers on how to increase meaningful Web 2.0 implementations in their classrooms (Jimoyiannis et al., 2013). Although we were interested in how social media are perceived and used by teachers for their professional learning, with what impacts on teaching practices, few formal PD studies actually tracked changes in teachers practices and/or in students learning. Only four studies considered the impact of PD on teachers practices, beyond their self-reported intent to change (Blonder et al., 2013; Blonder & Rap, 2017; Goodyear et al., 2014; Wang et al., 2014). In these studies, the researchers followed the participants for a length of time after the PD intervention to determine what, if any, lasting changes were made. Following up with participants via formal interviews was one approach (Blonder et al., 2013; Blonder & Rap, 2017), as was PD facilitators use of social media to maintain contact with participants and support them in making pedagogical changes over time (Goodyear et al., 2014). Wang et al. (2014) studied two cohorts of teachers and students, using the first iteration of the PD course to inform revisions for the second cohort. In addition to conducting multiple follow-up focus groups with the teachers across the three years of data collection, the researchers attempted to capture changes in student learning. They found that students confidence on a survey of information and communication technology (ICT) skills was higher in the experimental group than in the control group but cautioned that other factors could have influenced the results. Thus, while acknowledging the importance of formal PD that has a lasting impact on teachers and their students learning, few studies of formal teacher PD with social media actually assessed any impact or change over time. Informal learning with social media. At the beginning of this article, we summarized prior research on teachers informal learning that suggested that teachers turn to these communities and networks, including those beyond school boundaries, to find inspiration, unique resources, diverse expertise, and more, perhaps especially in managing innovation (Frank et al., 2011). Of the 58 reviewed articles, 33the largest portion of our data setpresent research on how social media are perceived and used by teachers for their informal professional learning. These studies emphasize the affordances of social media both as doorways to wider networks of knowledge and as spaces that address teachers more immediate individual and social needs (e.g., combating loneliness, finding emotional support). The following sections present the four emergent themes that we identified with respect to teachers informal learning with social media: self-directed learning; revisiting communities and networks; defining meaningful participation; and impacts on teachers practice. Self-directed learning. The most prominent theme, present in two thirds of this subset of articles, was teachers references to social media as providing just-in-time supports for their individualized needs. Self-directed learning, or facilitating learners choice and control over what and how they learn and at what pace, is advocated in recent U.S. educational policies (Office of Educational Technology, 2017) and manifested here in our findings. For example, in Holmes et al. (2013), educators exercised autonomy over their learning; they used Twitter to share and find resources, as well as for social support. In T. Davis (2013), teachers reported most valuing their professional learning network (PLN) on social media because of its 24/7 availability, diversity, community, and general ease of use. Across the studies, teachers appreciated the flexibility of social media as spaces that were always convenient and adaptable to their individual needs (Carpenter & Green, 2017; Greenhalgh & Koehler, 2017; Hur & Brush, 2009; Lapham & Lindemann-Komarova, 2013; Rodesiler, 2014; Ross et al., 2015; Wesely, 2013). The convenience teachers ascribed to social media was tied to the range of resources made available through shared materials and diverse networks. In Carpenter and Krutkas (2015) study of teachers Twitter use, Twitter was found to be efficient, accessible, and interactive, connecting teachers to communities and teaching-related resources beyond their immediate schools and districts. Many studies noted the importance that teachers placed on resource sharing in particular (e.g., Cinkara & Arslan, 2017; Ranieri et al., 2012; Rutherford, 2010; Sumuer et al., 2014; Trust, 2016, 2017a, 2017b). Furthermore, this theme of teachers tapping into social media for self-directed, informal professional learning encompassed more than exercising control over what, how, when, and from whom they accessed relevant resources; teachers were also seeking relief from isolation and emotional support from networks of peers (Ab Rashid, 2017; Kelly & Antonio, 2016). For example, in Visser et al. (2014), Twitter served as more than self-directed PD; it served as a public space in which teachers reportedly engaged in meaningful interpersonal relationships within a participatory culture. The studys authors defined participatory culture as informal memberships within an online community in which individuals can express themselves, contribute and produce information, learn from and collaborate with others, and share or contribute their creations and knowledge (Jenkins et al., 2006). Teachers stepped into social media spaces to combat the isolation of their individual classrooms and build a sense of belonging with others (K. Davis, 2015; Rodesiler & Pace, 2015; Trust et al., 2016). Community. A second theme present in the research on how teachers used social media for informal professional learning focused on its community aspects. Specifically, a number of studies examined #edchat, a teacher-initiated weekly conversation on Twitterdesignated with the Twitter hashtag #edchatthat draws thousands of teacher-participants from around the world. For instance, through the lens of CoP theory, Britt and Paulus (2016) examined a group of teachers meeting online via #edchat to discuss their own PD. The researchers identified several indicators of a strong community of practice, including sustained relationships, quick agreement on problems to be tackled, and speedy information-sharing. Similarly, using interviews and analysis of online activity within #edchat, K. Davis (2015) found it to be a supportive, learner-centered space for educators: While participants experienced the pace and volume of information as being overwhelming at times, educators developed skills to manage this and perceived discussions to be learner-centered and supportive (p. 1551). K. Davis (2015) described teachers collaborative inquiry and the sense of belonging that teachers found through Twitter. Gao and Li (2017) analyzed the network structure and practices within one hour on #edchat. The researchers found that almost 60% of the posts in the hour studied were about how to integrate technology into teaching (Gao & Li, 2017). Other posts were about building relationships and related topics. Rehm and Notten (2016) looked at a German-language version of #edchat (i.e., #edchatde) from a social capital perspective. The researchers found that teachers developed social capital, or relational resources and knowledge, by participating in this Twitter community (Rehm & Notten, 2016, p. 220). Wesely (2013) conducted a netnography, or ethnography of Internet cultures, of teachers participating in #edchat, with a focus on how these teachers used their social media contacts over a year to develop a community of practice. The study found evidence that an online, dispersed CoP focused on PD for teachers can successfully support learning in a variety of ways (p. 315). In aggregate, these studies depict a widely popular, teacher-driven space within social media that demonstrated aspects of an informal professional learning community or network. Britt and Paulus (2016), quoting one teachers tweet, stated, I learned more in a year on Twitter than my previous fourteen years in education. #edchat (p. 57). On the other hand, disagreements regarding the framing of teachers professional learning in social mediathat is, as a community of practice, learning network, affinity space, or something elsewere evident in the literature. Of the 33 studies addressing teachers informal learning, six applied a CoP framework (Britt & Paulus, 2016; K. Davis, 2015; Holmes et al., 2013; Hur & Brush, 2009; Trust, 2015; Wesely, 2013), five applied PLN perspectives (T. Davis, 2013; Noble et al., 2016; Ross et al., 2015; Trust et al., 2016; Visser et al., 2014), two used affinity spaces (Carpenter & Krutka, 2015; Rosenberg et al., 2016), one proposed a network of practice (Ranieri et al., 2012), and one generated the notion of a professional development network (Trust, 2017b). As mentioned earlier, just as teachers are tapping social medias open and closed capabilities for various purposes, forging new terrain in their intersections, teachers are also tapping into social media for professional learning in ways that problematize existing definitions and resist conventional boundaries. For example, although several studies conceptualize teachers informal learning within social media (e.g., #edchat) as CoPs (K. Davis, 2015; Holmes et al., 2013; Hur & Brush, 2009; Wesely, 2013), other studies suggest that existing definitions of CoPs are inadequate to describe the networking practices observed. Britt and Paulus (2016) argued that #edchat meets most aspects of a CoP, but also that teachers informal learning with Twitter is redefining what constitutes an online CoP (p. 57) and what should be considered effective PD. Similarly, Trust (2015) concluded that the math subject community on Edmodo aligned with only some aspects of a CoP; she generated instead a new framework from her findings: a professional development network. Participation. As noted earlier, understanding teachers informal learning with social media as meaningful participation (Sfard, 1998) in communities of practice (e.g., Britt & Paulus, 2016; Trust, 2015; Wenger, 1998), PLNs (e.g., Trust, 2012), or affinity spaces (e.g., Carpenter & Krutka, 2014; Rosenberg et al., 2016) is a prevalent theme in the literature; however, about a fifth of the studies in the informal learning category (seven out of 33) also noted a lack of active participation among many teacher-users. Robson (2017), for instance, described teachers passive and active engagement on Facebook and a discussion forum, tying both forms of engagement to professional identity construction. Greenhalgh and Koehler (2017) noted that approximately 11% of participants in #educattentats posted original tweets and that more than half of the original tweets were contributed by the most active 1% of contributors. Cinkara and Arslan (2017), Gao and Li (2017), Rosenberg et al. (2016) and Rutherford (2010) reported similar findings among teachers on Twitter and in Facebook groups: Participation was most characterized as active among a small group of users with few posts per teacher on average. Trust (2017b), who studied teachers participation in the math subject community on Edmodo, found that large numbers of users (thousands) viewed and shared resources gathered from the math subject community wall, but very few teachers added material to the wall or interacted with the creator through comments: The wall grew by 510 new posts each day, and posts received an average of only 4.9 comment replies. Considering the self-direction, community, and just-in-time affordances that teachers reportedly value on social media, these studies suggest some discrepancies between perceived benefits and their distribution and measured utilization. Our data set indicates rich insights from the most active users, yet the majority of teachers accessing social media platforms are not well represented. Moreover, as we consider what teachers learning as participation means in these social media contexts, we know even less about indirect participation and contribution (e.g., liking, sharing, favoriting, retweeting, mentioning, replying) beyond original posts, like tweets or comments, or the impacts of these forms of participation on the participant or the community, network, or space. Impacts on teachers practices. Although the reviewed studies report informal learning on social media as meeting many of teachers individualized needs that are not easily addressed through formal trainings, there was only limited discussion of how this more self-directed PD impacted pedagogy. Four of the 33 studies in this category directly considered changes in teacher practices, most incorporating self-report questions asking teachers to reflect on whether they perceived growth in their pedagogy (Carpenter & Green, 2017; Trust, 2017a; Trust et al., 2016). All four studies indicate teachers belief in the positive changes informal PD brings to their teaching. In Trust and colleagues (2016) study, for example, 68% of teachers reported that their PLNs impacted their practice and learning. Noble et al. (2016) offered perhaps the most in-depth view on the impact of informal learning experiences in the classroom. Interviews with the four social studies teachers in this study revealed that trust was important in making online PD through Twitter effective; it increased teachers confidence. Teachers cited specific examples of how their experiences on Twitter inspired more student-centered teaching, such as facilitating creative project-based assignments, integrating live Twitter streams into lessons, and adopting flipped classroom approaches in which students interacted with content online outside of class, complemented by active, hands-on in-class activities. Although the literature supports social media as a promising informal learning space for teachers, the field lacks supporting evidence for this claim beyond teacher approval. Critical directions for research on teachers PD are to examine how teachers are (or are not) applying what they learn on social media and what changes in pedagogy or practices they are making as a result. LIMITATIONS A limitation of this review is that by incorporating only research published in English and in peer-reviewed, education-related journals, we overlook potentially similar or divergent trends in non-English-speaking countries and in other disciplines that could help broaden and enrich our perspective (e.g., see Rehm et al., 2019, for a network analysis of the social media in education research across multiple disciplines). Another limitation is the array of terms that researchers use without agreement regarding what they meansocial media, learning, engagement, global, and so onsuch that different uses of these terms necessarily change how we view the findings and the conclusions we can draw. DISCUSSION AND IMPLICATIONS This literature review examined how social media are perceived and used by K12 teachers for their teaching or professional learning, with what impacts on teachers and their students. We hope that addressing this question is a first step toward defining beneficial teacher practices with social media and understanding how the interplay between various types of professional learning opportunities can facilitate such practices. Although research on K12 teaching and teacher learning with social media is on the rise, the current knowledge base covers mainly teachers informal professional learning. Social media have been widely adopted, with potential research contexts around the world, yet research in English has been carried out mainly in developed countries in North America, the Middle East and Europe, with a focus on Twitter and Facebook and on secondary-level schooling. This situation could be due to the pace of research, which typically lags behind technological advancements, as well as education policies, technical infrastructures, or organizational cultures that constrain the adoption of social media in education and limit the scope of these findings to the regions represented in the reviewed studies (Macià & Garcia, 2016). In terms of methods, we found that mixed-methods and qualitative research approaches dominated in the reviewed studies. This finding is consistent with what others have found (e.g., Macià & Garcia, 2016) and with the early state of the field. With social media rising to mainstream use only since the early 2000s, we are still in the beginning stages of theorization and research, with an abundance of implementation studies, or studies that investigate how technologies already in use are being implemented and attempt to explain how, why, and for whom the technological approach works well in given situations (Roblyer, 2005). This type of study contrasts with other types needed to advance the field of education and educational technology, most notably studies that establish the technologys effectiveness at improving student learning; that report on common uses to shape educational practices; and that monitor impact on important societal goals (e.g., equity goals, citizenship goals; Roblyer, 2005). Despite the prevalence of survey methods, we were encouraged by the number of studies that incorporated teachers understandings of social media (e.g., through interviews or focus groups) and digital artifacts of practice (e.g., social media posts). We need more research efforts that triangulate teachers and students perceptions and experiences of social media with observations of what they actually do within particular platforms. Data on teachers pedagogy and students work as evidence of learningbeyond test scoresare especially important in this regard. We also advocate design-based research, which focuses on the collaborative and iterative development of interventions in context (Brown, 1992; Collins, 1992). In design-based studies, practitioners and researchers collaborate to develop, adjust, and evaluate new practices. Through iterative cycles of design, implementation, and study in naturalistic settings, design research can help teachers and technology co-evolve (Zhao & Frank, 2003). Along with these methodologies, social media provide opportunities to expand educational research practices because of (a) digital traces created and left behind with social media use, (b) the scalability of data, as these traces can be studied in their minutiae or collected en masse, and (c) emergent forms of digital methods, such as new ways of combining human and machine methods necessary to conduct both large-scale and small-scale studies (Greenhow et al., 2019, in press). For instance, Staudt Willet (2019) collected digital traces related to approximately 1.2 million tweets containing #edchat, which provided an opportunity to study both broad trends in educators contributions to ongoing conversations about educational practices organized by the #edchat hashtag on Twitter, and the specific purposes evidenced by the content of these tweets. Taken together, digital traces, scalability of trace data, and emergent digital methods provide new techniques and contexts for educational researchers exploration. Conceptually, the different theoretical models present in the reviewed studies limit comparison of findings across studies. For instance, the variations in definitions used to conceptualize the informal learning structures studiedcommunities, networks, or a combination thereofalign with the diversity of frameworks uncovered by Macià and Garcias review (2016) of research on teachers online informal learning generally. However, as Trust (2015) and Britt and Paulus (2012) have demonstrated, this variation also helps generate new models where existing ones fail to help us understand these complex phenomena, such as teacher learning that occurs at the intersection of traditionally defined formal and informal learning structures. Interestingly, only one quarter of the reviewed studies actually focused on classroom teaching with social media in K12 education. Among this subset, only five articles addressed subject matter teaching with social media in a particular lesson or learning activity, and of these, only one study (Van Vorren & Bess, 2013) attempted to connect teaching with social media (i.e., Twitter) to student learning or outcomes. Despite this lack of evidence of the clear connections between teaching with social media and impacts on teachers practices or students learning, teachers perceived the integration of social media as benefitting student engagement and connections between students, between students and teachers, and, in one case, to a global citizenry beyond school walls (Carpenter & Justice, 2018). That said, reformers visions of opening the contexts for learning and exposing students to distributed expertise and resources beyond classroom and school borders were not realized in this literature (Office of Educational Technology, 2017). Likely contributing to this gap between the vision of technology in education and the reality are the challenges reported in the reviewed research to implementing social media in classrooms (e.g., lack of supportive policies, curriculum constraints, lack of time, negotiating social media as an informal learning space within a formal learning setting). These challenges align with those previously identified in the technology integration literature, such as negotiating local school norms and expectations of academic work with external social media norms and literacies (Zhao & Frank, 2003). As stated in the U.S. National Educational Technology Plan (Office of Educational Technology, 2017), using technology such as social media to bridge informal and formal learning across home, school, and community is often a missed opportunity: Historically, a learners educational opportunities have been limited by the resources found within the walls of a school. Technology-enabled learning allows learners to tap resources and expertise anywhere in the world, starting with their own communities. . . . Few schools have adopted approaches for using technology to support informal learning experiences aligned with formal learning goals. Supporting learners in using technology for out-of-school learning experiences is often a missed opportunity. (pp. 89) Teacher PD is often cited in the technology integration literature as very important to helping teachers improve or reform their practices. As mentioned earlier, the majority of reviewed studies addressed the integration of social media for teachers formal or informal professional learning. Teachers formal PD focused on content-specific technology integration or the integration of social media generally in ones teaching but did not mainly assess the impact of the PD on either teachers practices or students learning. The field would benefit from more design-based research that examined the development, implementation, and assessment of social-media-enabled teaching and learning over time, including digital trace data and social media analytics, which could document teachers and students work as evidence. Furthermore, our literature review revealed that teachers turned to social media for informal learning purposes. They used social media, mainly Twitter, to direct their own learning and participate in communities and networks. Our findings that teachers main practices in using social mediaresource exchange, garnering emotional and social support, learning about technology integration and other topics, and combating isolationaligned with those reported in similar reviews (Macià & Garcia, 2016). However, as we consider teachers informal learning through the lens of learning as participation (Sfard, 1998), the lack of participation among teachers on social media, as reported in several studies, gives us pause. What does meaningful teacher participation for learning on social media look like, and how should it be fostered and measured today? Preece et al. (2004), in studying online communities more than 15 years ago, suggested that people use communities online to lurk, or observe, for several reasons: They wish to understand community norms and conventions before participating, they question whether their participation will be helpful to others; they lack the technical skills to post; or they do not need to post. Macia and Garcia (2016) argued that the notion of communities is problematized in the informal teacher professional development literature; research documents the lack of discussion, consensus, and teaching materials posted by a minority of teachers in these online spaces while the majority of teachers use them without posting feedback. On the other hand, as we have seen, technologies such as social media extend and reframe how people organize and express boundaries and relationships (Carpenter et al., 2019; Wenger et al., 2009), making new conceptions of communities and networks possible that, in turn, require a reframing of meaningful participation as learning: The potential of holding groups of different dimensions . . . degree of public openness, and the opportunity to join new communities . . . make new kinds of participation possible. This kind of participation is an important source of learning for teachers who observe but do not directly participate, although active members are not always aware of this invisible process. (Macià & Garcia, p. 293) Research on teachers informal learning online is not extensive in contrast to the vast number of studies that have investigated teachers formal PD online (Dede et al., 2009). The field needs more research on how and why teachers acquire knowledge and learn through participation in informal learning opportunities via social media, including those invisible or indirect processes of reading, curating (e.g., favoriting), sharing, passing along others information (retweeting), and more. In addition, we need more research on what impact participating in these social media configurations has on teachers PD, especially their development of new or improved teaching practices. Our findings extend those of Macià and Garcia (2016), who noted in their literature review on teachers informal learning online that none of the research reports impact teachers classroom practices, making it difficult to establish direct links between conversations and activities on social media and intentional changes in classroom practice (p. 304). We need research that goes beyond teachers reported perceptions of positive change to examine actual artifacts of teaching and students learning. We also need educational research that investigates the interplay, or boundary crossings, between teachers formal and informal learning with social media tied to changes in pedagogy. Recent research suggests that online participation in informal PLNs should be combined with other forms of PD to provide the mechanisms for teachers to contextualize their conversations in practice. In Cranefield and Yoong (2009), the existence of multiple engagement spaces (communication and sense-making settings) in combination with the focus of a professional change programme created a high number of boundary crossings opportunities and activities (p. 270), which required recontextualizations and personalization of new professional knowledge. What is the interplay between teachers learning through knowledge acquisition and participation in formal PD, and their learning through informal interactions with local and external teacher-networks? How does this interplay affect teachers implementation of innovations? Frank et al. (2018) argued that the intersections of formal and informal processes raises an interesting proposition about the primacy of either. On the one hand, informal interactions among teachers can affect teachers commitment and sense of efficacy . . . on the other hand, implementation reforms certainly depend on the direct support of formal leaders. (p. 305) If teachers are shaped through conformity to school norms, school-based teacher social networks, and formal PD opportunities (Frank et al., 2018), informal networks of teachers via social media that transcend the school boundary can also shape teachers and schools, and provide important new terrain for educational research. 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