Yelp adds places to their database, and they have had mixed success with Mechanical Turk. http://engineeringblog.yelp.com/2011/02/towards-building-a-high-quali

Yelp adds places to their database, and they have had mixed success with Mechanical Turk. http://engineeringblog.yelp.com/2011/02/towards-building-a-high-quality-workforce-with-mechanical-turk.html http://engineeringblog.yelp.com/2011/02/towards-building-a-h...