Facebook Inc., operator of the largest social network with more than 1 billion members, is working with the U.S. Federal Bureau of Investigation to probe a malware attack, people with knowledge of the matter said.
Facebook said Friday that it was subjected to a "sophisticated attack" by hackers last month, without saying where the attack originated. Investigators haven't found any evidence that user data was compromised, Menlo Park, Calif.- based Facebook said on its website. The people who discussed the FBI's involvement asked not to be identified, citing the sensitive nature of the probe.
Facebook, which stores information on users, often grapples with attempted breaches. It has a team dedicated to detecting and responding to attack attempts, pays bounties to outside programmers who help identify malfeasance and said it successfully prevents attacks the "vast majority of the time."



