Facebook has drawn more attention as a platform for adolescent meanness and bullying, and as a vehicle for high school and college students to ruthlessly dissect their teachers. But people who are 20, 30 or 40 years beyond graduation are using Facebook to re-establish relationships with teachers and express gratitude and overdue respect.
http://www.nytimes.com/2010/07/14/nyregion/14facebook.html?_r=1&ref=technology