At Gigaom.com, Om Malik is preparing to get the inside scoop on the Yahoo v. Facebook suit. According to Malik, Facebook is getting ready to fight Yahoo back, citing "sources close to Facebook."
While the response isn't fully formulated, the source says that Facebook will counter with its own patents.
Facebook has already stated to the press:
We’re disappointed that Yahoo, a longtime business partner of Facebook and a company that has substantially benefited from its association with Facebook, has decided to resort to litigation. Once again, we learned of Yahoo’s decision simultaneously with the media. We will defend ourselves vigorously against these puzzling actions.
Whether Facebook will use its own portfolio or get business partners at Microsoft to join in the fight is still speculation. We will update as news becomes available.