Crowd Powered Shopping: JustBoughtIt
JustBought.it is a location-based social shopping app that allows you to share photos and tweets on amazing finds as you stumble upon them.
You can go shopping and discover where the hottest deals are in town and get instant feedback from your twitter community.
I think a great combination of using Twitter, Location-Based App, Social Shopping. And what I really like is the Customer Feedback & Feedback for the site itself. The principle; the crowd decides, even applies here, through posting and voting.
Hope to see more of such ventures and sites.