<p>actually MIT doesn’t
The MIT admissions office does not engage in this practice because it’s essentially an invasion of privacy - sites like Facebook are designed to be a community, a playground, etc for students - not designed to be a spying tool for Big Brother. To use them as the latter is, in my opinion, not terribly ethical. Admissions officers should get involved in these communities if they want to help applicants with the process, with the match - not if they’re out to use what they find there to hurt them.</p>