Founded in 2012 by John Zimmer and Logan Green, Lyft is a privately-held American transportation network company. Originally known as Zimride, Lyft provides a mobile phone application that facilitates peer-to-peer ridesharing by allowing passengers who need a ride to request one from available community drivers. Users sign up for the service through their Facebook account, and drivers and passengers rate each other on a five-star scale to establish reputations within the network.