In the last few years, the computer scientists and entrepreneurs who fuel Silicon Valley have gone through a bewildering series of transformations. Once upon a time they were ostracised nerds. Then they were the lovable geeks of the Big Bang Theory TV show, and for a short while they were superheroes. (In case you’re wondering, geeks wonder what sex in zero gravity is like; nerds wonder what sex is like.) Then it all went wrong, and now they are the tech bros; the anti-heroes in the dystopian saga of society’s descent into algorithmic rule by Big Brother, soon to be followed by extermination by Terminators.