Uber launched in San Francisco in 2009 as an app-based transportation network and has since expanded to 70 cities globally, raising $1.5 billion for expansion. Uber offered free promotional rides which helped gain more customers through word-of-mouth referrals. As the company has grown, Uber has seen increases in both employees and the number of rides given annually. Customers praise Uber's convenient and easy-to-use app that allows them to quickly request rides and see details of the driver and route.