Explaining why Facebook does not make him as paranoid as Google, science fiction writer Cory Doctorow says frenemies will doom the social network: "Adding more users to a social network increases the probability that it will put you in an awkward social circumstance.... That's why I don't worry about Facebook taking over the net. As more users flock to it, the chances that the person who precipitates your exodus will find you increases. Once that happens, poof, away you go — and Facebook joins SixDegrees, Friendster and their pals on the scrapheap of net.history."