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Facebook Says It Was Hacked, but No User Data Compromised

Facebook said on Friday it was the target of a series of attacks from an unidentified hacker group, but no user data were compromised.

"Last month, Facebook security discovered that our systems had been targeted in a sophisticated attack," the company said in a blog post. "The attack occurred when a handful of employees visited a mobile developer website that was compromised."

(Read More: Americans Willing to Spend More to Thwart Cyber Attacks: Survey )

Daniel Acker | Bloomberg | Getty Images

The company said as soon as it discovered the presence of malware, it "remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day."

What's Facebook stock doing now? Click here for the latest after-hours quote.

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  • Co-CEO, Revere Digital; Co-Executive Editor, Re/code; and Co-Executive Producer, The Code Conference. Re/code is part of the CNBC network.

  • Co-CEO, Revere Digital; Co-Executive Editor, Re/code; and Co-Executive Producer, The Code Conference. Re/code is part of the CNBC network.