Re/code: Arianna Huffington, the co-founder and editor in chief of the Huffington Post (and an Uber investor already), has joined Uber’s board of directors. As a director, Huffington is in the company of a number of key investors as well as executives like Benchmark general partner Bill Gurley, Uber co-founder Garrett Camp, head of global operations Ryan Graves and former policy and communications head David Plouffe.