Uber hit a whopping 5 billion rides in May, up from 2 billion rides a year ago. That equals an unquantifiable amount of passenger-driver interactions. Therefore, it's odd that reaching out to your Uber chauffeur has always been such a cumbersome process. The only option you had was to send a text to the driver's number, which can feel a bit too intimate for someone you don't know. To solve all that, Uber is launching a new in-app chat function -- making it easier than ever to hit up your caddie with updates.