This week, Yahoo (Nasdaq:YHOO) launched a patent lawsuit against Facebook. It’s unclear how it will impact the social giant’s upcoming IPO, but it certainly will be a big question on investors’ minds. And there might be additional threats to other highly valued social companies, such as Zynga and LinkedIn.
http://www.forbes.com/sites/tomtaulli/2012/03/16/startup-lessons-from-the-yahoo-facebook-patent-war/