Following up on its threat, Yahoo! has filed a patent infringement lawsuit against Facebook, reports paidContent.org. The complaint was filed in San Jose, Calif., federal court. In it, Yahoo! cited 10 patents related to web-based advertising and what it called "privacy patents."
With the lawsuit, according to paidContent, Yahoo! suggests that it created the building blocks for social networking with functionalities like messaging, news, and photo features, and that Facebook helped itself to those ideas. Said Yahoo! in the document, "Facebook's entire social network model, which allows users to create profiles for and connect with, among other things, persons and businesses, is based on Yahoo!‘s patented social networking technology."
According to paidContent, Facebook can respond to the suit in a number of ways such as denying that it is infringing, countering-suing with patents of its own, or seeking to invalidate Yahoo's patents.