Facebook like button years of questions from the public about whether it had an intention to incorporate a "Dislike" button, Facebook officially rolled out "Reactions" to users worldwide on February 24, 2016, letting users long-press on the like button for an option to use one of five pre-defined emotions, including "Love", "Haha", "Wow", "Sad", or "Angry". Reactions were also extended to comments in May 2017. The like button is one of Facebook's social plug-ins, in which the button can be placed on third-party websites. Its use centers around a form of an advertising network, in which it gathers information about which users visit
Criticism of Facebook have hosted seminars and presentations to discuss ramifications of students' use of Facebook and other social-networking sites. The EDUCAUSE Learning Initiative has also released a brief pamphlet entitled "7 Things You Should Know About Facebook" aimed at higher education professionals that "describes what <nowiki>[Facebook]</nowiki> is, where it is going, and why it matters to teaching and learning". Some research on Facebook in higher education suggests that there may be some small educational benefits associated with student Facebook use, including improving engagement which is related to student retention. 2012 research has found that time spent on Facebook is related to involvement