The College now has a student subscription to this site. If you direct students to access it with the username Sheldon and the password College they can access it at home. Either that or you can use it in the classroom.
Here is an example of a social network in education. I heard it recently called 'network learning.' Ning is the best platform I've found, although the adds can be annoying. (>)_(<)
We believe that a child who graduates from high school without an understanding of culture, the arts, history, literature, civics, and language has in fact been left behind. So to improve education in America, we're promoting programs, policies, and initiatives at the local, state, and federal levels that provide students with challenging, rigorous instruction in the full range of liberal arts and sciences.