Social Bicycles is a bike sharing system with a twist. Using an iPhone app, the system allows users to drop off, locate, and borrow a bike nearly anywhere. The bikes are equipped with a GPS device which is locked to one of the wheels, and when the bike is locked, it’s locatable using the app, so that someone can borrow it; when it’s in use and unlocked, it doesn’t appear in the app. Read more at www.engadget.com