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This Feb. 8, 2012 photo shows a mural at Facebook headquarters in Menlo Park, Calif. Intruders recently infiltrated the systems running the world's largest online social network but did not steal any sensitive information about Facebook's more than 1 billion users, according to a blog posting Friday, Feb. 15, 2013, by the company's security team.

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Facebook gets unwelcome look at hackers’ dark side

SAN FRANCISCO — Facebook is getting an unwelcome look at the shady side of the hacking culture that CEO Mark Zuckerberg celebrates.

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