Facebook has sued a little-known website for educators called Teachbook, claiming Facebook literally owns the “book” when it comes to naming social networking sites. “Misappropriating the distinctive book portion of Facebook’s trademark, defendant has created its own competing online networking community in a blatant attempt to become a Facebook ‘for Teachers,’” (.pdf) according to a filing in San Francisco federal court. Facebook, with some 500 million users, is policing its trademark in a bid to prevent others from capitalizing on its famous name or diluting its value. Facebook is not alone in pursuing trademark actions to protect household name recognition. Facebook’s lawsuit follows ...