"Facebook is pursuiting social networks it believes have copied their design or features by suing German social network StudiVZ. The Financial Times has reported that Facebook have filed a suit in the Californian Supreme Court against the German company for what it claims is an infringement of Facebooks “look, feel, features and services”." - Chris White via Bookmarklet
It will be interesting to hear what the specific violations are. Is the css protected, and what are these features that others aren't allowed to duplicate? - Chris White