What McGuirk said he’d rather see is administrators using Facebook to get students thinking about how they want to craft their public persona.

One picture McGuirk displayed was from the profile of a Fitchburg student pointing a gun at another person. The gun turned out to be a water gun, but McGuirk said he had a conversation with the student about the image he was projecting. Ultimately, the student decided to remove the picture.

Some students aren’t so lucky. In March 2005, a University of Oklahoma student was investigated by the Secret Service for making assassination references about President Bush on Facebook. In May 2005, two swimmers at Louisiana State University lost their scholarships for making disparaging comments about their coach on Facebook. —David Epstein —The Many Faces of Facebook (Inside Higher Ed)

This article says 2/3 of college students have a Facebook profile.