Facebook has announced it is to launch a "panic button" application on its social networking site.
The button, aimed at children and teenagers, will report abuse to the UK Child Exploitation and Online Protection Centre (Ceop) and Facebook.
The application will also appear on their homepage to say that "they are in control online".
The launch follows months of negotiation between Ceop and Facebook, which initially resisted the idea.
Ceop, the government law enforcement agency tasked with tracking down online sex offenders, called for a panic button to be installed on social networking sites last November.
Bebo became the first network to add the button with MySpace following suit, but Facebook resisted the change, saying its own reporting systems were sufficient.
Pressure mounted on Facebook following the rape and murder of 17-year-old Ashleigh Hall by a 33-year-old convicted sex offender, posing as a teenage boy, who she met on Facebook.