This is the kind of potentially fun time-waster that we can't believe no one has thought of before. Nike Shoe Boxxxx, a new app for Facebook, leverages 40 years' worth of the company's shoes to create a digital marketplace where fans can collect and trade their favorites. It's digital trading cards but with the focus on the sneakers instead of the athletes who wear them.

Users can display their personal collection in a digital showroom and trade sneakers with friends from around the world. Give Shoe Boxxxx a spin for yourself for the price of access to your profile at Facebook.

[via Gizmodo]