The founders of controversial social networking site Ask.fm have rather hastily changed their public approach to cyberbullying after a major backlash has seen advertisers withdraw from the site.

The mother of suicide victims Erin and Shannon Gallagher has said but for internet sites such as Ask.fm, her daughters would still be alive.

The founder of a website implicated in the suicides of two young Irish girls has insisted he is in no way responsible for what happened.