Teachers do not have to be a student’s friend to be helpful, but being a Friend (on social network sites) is not automatically problematic or equivalent to trying to be a kids’ friend. When it comes to social network sites, teachers should not invade a student’s space. But if a student invites a teacher to be present, they should enter in as a teacher, as a mentor, as a guide.
via zephoria.org
Our school district is now trying to "develop recommendations for using social media effectively (and safely) with students and the community."
Here is one example: http://www.d128.org/itfiles/District%20128%20Expectations%20for%20Electronica...