Facebook fired back on Tuesday in its legal battle with Yahoo by accusing the Web pioneer of infringing 10 of Facebook's patents, according to a court filing according to a Reuters report.
The counterclaim from Facebook, filed in a San Francisco federal court, comes after Yahoo a sued Facebook for patent infringement last month.
The dueling claims mark an expanding web of patent litigation that has already caught up the smartphone and tablet sectors and high-tech stalwarts such as Apple Inc, Microsoft Corp and Motorola Mobility Holdings Inc.
Yahoo's lawsuit against Facebook came at a delicate time, as the world's largest Internet social networking service is preparing for an initial public offering that could value the company at up to $100 billion….
Find out more at http://www.reuters.com/article/2012/04/03/net-us-facebook-yahoo-idUSBRE8320TY20120403
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