Silicon Valley is home to social outcasts, radical libertarians and nerdy geniuses who just want to be left alone. But their isolationist tendencies go beyond just wanting some space from the rest of the world. They dream of fleeing society completely and building tech-utopias. Seriously. We're not making this stuff up: Signs of such isolationist behavior are rampant, from self-contained campuses to virtual-world PC games to escapist events such as Burning Man. There are even cries for outright secession.