A patent headache for Facebook

The social network could become a bigger target in the Silicon Valley patent wars once it's blockbuster IPO is done and dusted.

As it prepares for one of the biggest IPOs ever, Facebook is coming under the same fierce attacks being waged against other big technology companies: patent lawsuits.

Last year, Facebook was named as a defendant in 22 lawsuits accusing it of patent infringement, double the number from 2010, according to a Reuters analysis of court documents on legal database Westlaw, a Thomson Reuters unit.

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