Education secretary Alan Johnson said that web companies have a moral obligation to ban videos showing people being harassed.

At a recent National Union of Schoolmasters and Union of Women Teachers conference, Mr Johnson said, I am calling on the providers of these sites to take firmer action to block or remove offensive school videos, in the same way that they have commendably cut pornographic content. By removing the platform, we’ll blunt the appeal.

This follows similar appeals from other UK teaching unions, including the National Union of Teachers and the Association of Teachers and Lecturers.