Advice from Facebook on how to use the site in the classroom. Near the bottom, find links for two downloadable booklets: Facebook for Educators and Facebook for School Counselors.
Some good advice here, but perhaps slightly dated. (Things change fast in the digital world). For example, I would probably skip creating the teacher presence to 'friend' students in favor of the group or page where you can interact without 'friending'.
Instructions for using RSS Graffiti to link a Facebook group with a Twitter Feed. Seems easy.