Normally you'd come up with use cases before you actually implement the idea :) You could encourage people to use it with any sort of online trade (craigslist /

Normally you'd come up with use cases before you actually implement the idea :) You could encourage people to use it with any sort of online trade (craigslist / ebay etc) but I don't think it'd take long for them to duplicate the behavior should this ever become very popular.