By Dan Primack
April 3, 2012

Two weeks after being sued for patent infringement by Yahoo YHOO , Facebook today filed its reply. It also filed counterclaims against Yahoo for allegedly breaching 10 Facebook patents, including ones that involve photo-sharing and content personalization.

“From the outset, we said we would defend ourselves vigorously against Yahoo’s lawsuit, and today we filed our answer as well as counter-claims against Yahoo for infringing ten of Facebook’s patents,” said Facebook general counsel Ted Ullyot, in a prepared statement. “While we are asserting patent claims of our own, we do so in response to Yahoo’s short-sighted decision to attack one of its partners and prioritize litigation over innovation.”

In other words,┬áif Yahoo wants to break Silicon Valley protocol by filing patent lawsuits, then Facebook will respond in kind — but it will simultaneously decry the practice, in a transparent attempt to retain its hacker credibility.

What follows is the Facebook filing. The counterclaims begin on page 12:

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