Facebook amends S-1 filing to note Yahoo patent suit, Ceglia updates

Facebook today made an update to its S-1 filing with the Securities and Exchange Commission to reflect the recent lawsuit Yahoo filed against the social network and the current status of proceedings with Paul Ceglia who claims partial ownership of Facebook.

Facebook says it intends to “vigorously defend” itself against Yahoo, which is claiming infringement on 10 patents related to advertising, social networking, privacy, customization and messaging. According to the filing, Facebook has not yet asserted any counterclaims or filed an answer to the suit.

The company did not make specific mention of the recent lawsuit from telecommunications company Mitel, which claims infringement of two patents. It did however add an update about the case with Paul Ceglia. Earlier this week, the company provided the court with more than 200 email exchanges between CEO Mark Zuckerberg and Ceglia in 2003. According to the latest S-1, Facebook filed a motion to dismiss Ceglia’s complaint and a motion for judgment on the pleadings on Monday. The company says, “We continue to believe that Mr. Ceglia is attempting to perpetrate a fraud on the court and we intend to continue to defend the case vigorously.”

Facebook did not amend the document to note its most recent purchase of patents from IBM. We received confirmation from Facebook that a sale did occur, but a spokesperson would not provide further information about the number of patents or price Facebook paid. According to unnamed Bloomberg sources, the social network bought 750 patents from IBM to help in cases of intellectual property. The company also added corporate and patent counsel to its job listings last week.