An update to the Nike+ GPS app allows motivation seekers to compete against friends in a remote game of tag.
There's no slapping involved; users sign up and recruit friends for a virtual game of tag based on running stats, with the laggard assuming the position of "it."
Users invite Nike+ friends or other contacts and choose to base the game on distance or speed benchmarks. The friend who runs the least distance or is slowest, is it.
It's $1.99 as a standalone or a free upgrade on iTunes.