More than 200 Brits have used Facebook's panic button to report suspicious behaviour on the social network, says the Child Exploitation and Online Protection Centre (CEOP).

The 'panic button', which was developed by the CEOP, finally installed on Facebook in July, after the social network caved to mounting pressure to install the app, following the murder of 17-year-old Ashleigh Hall. She met her killer Peter Chapman on Facebook.

The CEOP says the button has been used 211 times to report suspicious behaviour on the site. That's a seven-fold increase on the 28 reports the child protection organisation received about behaviour on the site before the button was introduced.

The CEOP also said the app had been downloaded more than 55,000 times since its launch and reduces the number of clicks Facebook users need to report an issues.

"It's great news that so many users have interacted with ClickCeop by downloading the application or by liking their page," said Joanna Shields from Facebook.

"There is no single answer to making the internet safer but CEOP have taken a great step forward by setting up their ClickCeop page."

See also: CEOP button accounts for 70% of web content reports