a few points of clarification. the teacher in question is a substitute teacher. not on staff. she's also the mother of a student there (pretty common at this school -- it's a charter school, earthier and crunchier than most).
the 3-day suspension rule is a bit extreme, I agree. but schools are very concerned about bullying and harassment online, so they're taking a hard stance. I can see why. there was another incident at this very school where one student started a facebook group with the title "XXX XXX is gay" (substitute a 7th grader's name for XXX XXX). he did it as a joke, but he got a 3-day suspension for it.
it's a real problem, and there aren't any easy solutions. saying "don't use facebook" isn't gonna work. the kids will use it, regardless. and at that age they really don't understand the implications.
cheers,
dt