Computer security analysts are seeing a surge in malware designed to target social networking sites like Facebook and Twitter, with incidences tied to one single bug -- known as "Koobface" -- up 200% in the first quarter of 2013. According to a threat report from McAfee, the number of identified malware samples rose by more than a quarter in the first three months of the year as hackers increasingly turn to social sites to intercept personal data for use in cyberespionage schemes.

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