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Two years ago, Facebook’s security team began noticing a surge in a particular strain of computer virus. The malicious software stole credit card information and other personal data belonging to thousands of Facebook users and spammed their friends with links to rogue websites, creating a global network of infected PCs.At first, Facebook played defense, helping victims clean their computers and attempting to block each new strain of the malware known as “Yahos.” But the virus kept mutating to avoid detection. So Facebook’s researchers did something unusual for a business being hacked: They investigated the hackers themselves, placing the giant social network at the forefront of a more combative strategy in the war against cybercrime.

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