Facebook revealed on Saturday that its internal network was hacked last month.
The attackers were able to access the tech giant's computer network after employees visited a mobile developer's website which downloaded malware - software often used to steal information - onto employees' laptops.
Facebook helped the FBI take down an international crime ring that used a botnet to infect 11 million computers and steal more than $850 million, one of the largest cybercrime hauls in history.
The FBI announced today that with the social-networking giant's assistance, it had arrested 10 people from countries around the world who it said used the Yahos malware and Butterfly botnet to steal victims' credit card, bank account, and personal information.
Last week Facebook suffered an "error" that had an astounding ripple effect, as users of thousands of popular websites were inadvertently redirected to a Facebook error page. It was shocking to learn that Facebook Connect could disrupt every site it linked to -- but even more troubling was the glimpse it gave us of future hacker attacks.
Facebook has deleted all European facial recognition data, the Irish data protection commissioner and a German data protection regulator confirmed independently Thursday after reviewing parts of the social network's source code.
Facebook's new Graph Search has security experts warning people who use the social network to raise their privacy settings in order to avoid embarrassment or becoming victims of cybercriminals.
Graph Search, which Facebook introduced this month and is rolling out gradually, lets people use naturally phrased queries, such as "Mexican restaurants my friends like," and receive personalized results. The service makes a lot more useful information available to people, and it gives Facebook a new venue for selling advertising.