It is not clear what the hackers wanted. Facebook is a good source of personal data, which is generally taken by advertisers and Facebook and its business partners. One theory is that they were after exclusive pictures of cats with funny expressions and details about what Americans ate for lunch. Facebook said that the attacks appeared to have been carried out by a bunch of organised hackers last month.
Writing on its bog, Facebook claimed that its security discovered that our systems had been targeted in a sophisticated attack, The attack occurred when a handful of employees visited a mobile developer website that was compromised. The social network, which says it has more than one billion active users worldwide, added: "Facebook was not alone in this attack. It is clear that others were attacked and infiltrated recently as well."