Ask.com chief executive explains Ask.fm purchase

The controversial social network Ask.fm has been bought by the owners of Tinder and Ask.com for an undisclosed fee.

The site, on which members answer questions posed to them by other users, was previously linked to a series of teen suicides in the UK and elsewhere, and has been criticised for not doing enough to prevent cyber bullying.

Ask.com's chief executive Doug Leeds told the BBC that his company "would not have got involved" if they did not think they could improve safety on the site.