The posts at Volokh and at PrawfsBlawg about the "ethics" of law professors (and academics more generally) being "Facebook friends" with their students has prompted long strands of commentary at both sites. One matter of the debate which seems not to have been articulated is that Facebook is simply a platform for relationships - not a new relationship in and of itself. To the extent that there are "ethical" or other professional concerns with relationships between professors and students, they apply in exactly the same fashion whether the relationship exists on Facebook or not. If a friendship or relationship would be inappropriate when taking place in the student lounge, then that same friendship or relationship would inappropriate, and to the exact same extent, if it takes place on Facebook. I think there's decent reasons for professors and students to preserve their social interactions at some distance, but Facebook has no bearing on that conclusion.