Not patent or copyright for a change. This time it's trademark infringement. 
http://mashable.com/2011/08/04/facebook-vs-shagbook/
When looking at it, Shagbook has a point. The term "facebook" was around well before Facebook.
It reminds me of Apple trying to keep the term "app store" all to itself. Though that was an even more extreme case.

http://mashable.com/2011/08/04/facebook-vs-shagbook/
Quote
In an eyebrow-raising trademark battle, Facebook filed suit against adult dating site Shagbook in May. Facebook’s contention: that the world’s largest social network would be “damaged by the issuance of a registration for the mark Shagbook.”
Shagbook has now filed its own opposition, along with counterclaims, with the United States Patent and Trademark Office.
As represented by SNRG Ventures, Shagbook, in the filing, “denies the allegation that Facebook is highly distinctive as it is a generic term.” It also challenges the validity of Facebook’s trademark, arguing that it should never have been granted.
When looking at it, Shagbook has a point. The term "facebook" was around well before Facebook.
It reminds me of Apple trying to keep the term "app store" all to itself. Though that was an even more extreme case.










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