Facebook's social media accounts were temporarily taken over by a group of hackers on Friday afternoon.
The hacking group OurMine posted on the Twitter and Instagram accounts for Facebook and Messenger, writing "even Facebook is hackable".
The accounts have now been restored.
OurMine claims its attacks are a attempts to show cyber vulnerabilities. In January it hijacked over a dozen accounts for teams in the US National Football League.
The group posted a statement on Facebook's Twitter account. "Hi, we are OurMine. Well, even Facebook is hackable but at least their security is better then Twitter."
It also hijacked the Facebook and Massager accounts on Instagram to post a photo of OurMine's logo.
Facebook's own website was not hacked.