Today, we have news coverage on Yahoo's threat to sue Facebook for infringement of 10-20 social networking patents unless Facebook pays for a license as Facebook approaches its IPO. This tactic to sue for patent infringement right before the IPO is a well known tactic for reaching settlement (who wants to risk a lower evaluation and/or amend the S-1 document to describe a major patent suit?). Here's links to articles giving the details below:
Yahoo Warns Facebook of a Potential Patent Fight - New York Times
Yahoo Picks Patent Fight with Facebook - CNET
Yahoo Stabs Facebook in the Back, Says Pay for Its Patents or Get Sued - TechCrunch
Why Yahoo! Should Seek at least $3 Billion from Facebook for Patent Violations - Forbes
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