Uber

The Uber Technologies Inc. logo is displayed on the window of a vehicle after dropping off a passenger at Ronald Reagan National Airport (DCA) in Washington, D.C., U.S., on Wednesday, Nov. 26, 2014. Uber Technologies Inc. investors are betting the five-year-old car-booking app is more valuable than Twitter Inc. and Hertz Global Holdings Inc. Photographer: Andrew Harrer/Bloomberg via Getty Images