Why Schools Should Learn To Use Online Services Like Facebook & YouTube Rather Than Banning Them [Techdirt]
50 Reasons to Invite Facebook Into Your Classroom [MindShift]
Tiny Bursts of Learning [Betchablog] - On Twitter as a powerful professional learning tool for teachers.
3 Tips for Teachers Using Social Media in the Classroom [Mashable!] - Written for college, but the 3 tips apply across the board.
Common Sense Social Media Policies in Schools: Working with It Instead of Banning It [The 21st Century Principal]