A senior police officer responsible for protecting children online has hit out at some of the world’s leading social-networking sites. Jim Gamble, head of the Child Exploitation and Online Protection Centre (Ceop), said Facebook and MySpace could do more to keep youngsters safe. His comments came after their competitor, Bebo, now owned by AOL, adopted the “Ceop report” button, which enables users to report online abuse and bullying. A Facebook spokesman said the company works closely with police and is interested in seeing how the Ceop button works on Bebo.