Very good article on Wired about Silicon Valley’s Bizarre Politics. Can a Republican proudly march in a gay parade? Can you defend open immigration policies and lower taxes? In Silicon Valley, yes you can. And probably all around the world.
However (sorry for disappointing), that's not a Silicon Valley innovation. It's probably one of the clearest political trends of the last decades. Fashionable, but pretty unstructured and even contradictory political thought.