Public schools and districts use social media to share announcements and communicate with parents and the community, but alongside such uses run risks to students’ privacy. Using a novel data set of 18 million posts on Facebook by schools and school districts in the United States, we sought to establish how frequently photos of students were shared. Through sequential mixed-methods, we estimated that around 4.9 million posts included identifiable images of students and that approximately 726,000 of these posts also included students’ first and last names and their approximate location. We discuss these findings’ implications from a data ethics perspective.