After enabling the option to "get cheers" from Facebook, runners can start their run while the app publishes the start of the workout to Facebook. As readers choose to cheer you on, those status messages are pushed to the app itself. That way, the runner can receive notes of encouragement while they're on the road.
Likewise, the app will publish the completion of the run to Facebook (and Twitter, if enabled). It sounds like a fun way to stay motivated, if that's your thing.
Version 2. 0 of the free Nike+ GPS app is out now.