Social networking site Facebook is allowing users to add a 'panic button' onto their profiles.
Users can now install an application created by the Child Exploitation and Online Protection (CEOP) Centre.
It adds a new page to your profile, which links to advice on staying safe online and a place where you can report anything that may be worrying you.
The application is called ClickCEOP and is designed to help protect under 18s in the UK who use the site.
Bebo was the first social networking site to introduce a panic button, followed by MySpace.
In March, Facebook said it wouldn't allow such a feature, but this new agreement comes after months of talks between the site and CEOP.
It's thought that around a quarter of eight to 12-year-olds are signed up to social networking sites, even though most say you have to be 13 or older to have a profile.