One teacher had found himself suspended because of a defamatory comment on Twitter, said Prof Phippen.

BBC: Cyberbullying may force out young teachers, says union

After these teaching students in Massachusetts scored so poorly on their certification test, one would-be teacher made the absurd comment that there must obviously be something wrong with the test -- not with those taking it.

FORBES: Fact and Comment

If a teacher is dealing with a student through social media and it's within the bounds of the teacher-student relationship, and it's related to school and all that, I have no comment on that.

WSJ: City Lays Out Digital Rules for Teachers