Facebook 'target of sophisticated hacking'.
Facebook has said hackers have infiltrated some of its employees' laptops in recent weeks.
This makes the the world's number one social network the latest victim of a wave of cyber attacks, many of which have been traced to China.
It said none of its users' data was compromised in the attack, which occurred after a handful of employees visited a website last month that infected their machines with so-called malware.
"As soon as we discovered the presence of the malware, we remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day," Facebook said.
It was not immediately clear why Facebook waited until now to announce the incident. Facebook declined to comment on the reason or the origin of the attack.
A security expert at another company with knowledge of the matter said he was told the Facebook attack appeared to have originated in China.
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