Teachers are being driven off social media by students filming staged classroom incidents and posting them online in an attempt to embarrass and humiliate staff, a union leader has warned.
Chris Keates, the general secretary of NASUWT, claims teachers in England have reported troublesome children seeking YouTube hits by secreting filming riled teachers.
Others are said to have taken "upskirt" or "downblouse" images of their teachers or have edited their faces on to pornographic images.
Teachers have also reportedly received death threats which have come from students and others have been targeted on Facebook.
Keates told the Press Association at the NASUWT conference in Birmingham: "What the person watching the film doesn't see is what the pupils are doing, they've just got a picture of a teacher getting irritated."
She added: "We've had teachers who have said they have stopped using social media themselves, they don't want to look on social media and perhaps find comments about themselves because they don't think they will go back into the classroom again.
"Some have said they felt humiliated in front of pupils and it's adding to the anxiety and pressure that goes with the job anyway."
Although she spoke of schools which have clear policies on mobile phone use in school, insisting that devices are locked away and used only once lessons have finished for the day, she claims others are not as strict.
Keates questioned why "if some schools can do it, why can't all? That would make sure at least one of these pressures that teachers are facing in the job is actually removed from the classroom."
She also said "parents have a really key role to play...technology has transformed the working lives of teachers and learning for pupils, but like all things it can be abused.
"There is a real issue of parents talking to their children about how they use this responsibly, but also not engaging in that themselves."