Inventor Gets Nothing

The tangled history of Facebook Mark Zuckerberg the founder of Facebook, which has been valued at 1 billion US, has been sued by two fellow Harvard classmates who claim that Zuckerberg stole the idea from them. The problem is that all three liberally took their ideas from Aaron Greenspan who created houseSYSTEM a site for Harvard students. Without a patent does the idea have any protection beyond copyright? Maybe Zuckerberg should ask Microsoft for help.