Facebook has identified the group or individual responsible for the attack on its systems that spammed users with porn and violent images earlier this week.

Facebook said that the attack "exploited a browser vulnerability" to spread the images in news feeds and wall pages.

The content was spread unknowingly when people were tricked into copying and pasting malicious JavaScript into their browsers.

No Facebook accounts were compromised or accessed during the spam attack, according to Facebook.

The social site has determined who was behind the attack and is working with legal enforcement agencies on the matter, but declined to share these details with the public at this time.

However, Facebook has ruled out hacking group Anonymous, which early reports had suggested could be responsible.

Full story: V3.co.uk