It’s a lengthy article, but well worth a read – especially if you are friending students in Facebook or are considering it…
I would agree that educators should never friend their students on Facebook. The best approach and the best way to harness the power of Facebook for your classroom is to set up a Facebook Fan Page for your classroom AND for your school. Fans and Friends of the same person will never see what’s on the other’s pages.
If you are a teacher, choose the ‘Public Figure’ option and as soon as you have at least 25 fans, you can create a simple, custom URL for your Facebook Fan Page to make further distribution easier.