This scoping review of research explores which disciplines have studied social media as it relates to education and, more broadly, use by students of high school and college age. The sample explores 10 years of research (2009–2018). A search of Web of Science yielded 580 relevant peer-reviewed articles published through the end of 2018, with 260 (44.8%) of these articles focused on education. Research in this area has been on a steady upward trajectory since 2009, the first year when relevant social media articles appeared. About half of this research was conducted in North American settings, and quantitative surveys were the most popular data collection method. Findings show that within education, the dominant themes of research on social media were use as a teaching and learning tool; adoption, use, and beliefs; digital literacy; effects of use; and identity. Outside of education, the dominant themes were negative behaviors, health issues, identity development and expression, digital citizenship, and social relationships. This review shows several areas where education researchers and practitioners would benefit from attending to research conducted outside of our discipline. Although the field of educational research sufficiently addresses issues like teacher professional development and pedagogical uses of social media, the larger issues that affect our students and, in turn, the school context are being explored in other disciplines.