Yelp has launched deals for their check-in service. This is similar to what Facebook recently started offering and the business that Foursquare has been working on for a long time now. Now when you check into venues using the Yelp mobile application, you will see coupons and deals.
This isn’t the only idea that Yelp took from Foursquare. Yelp took the “mayor” idea from Foursquare. Foursquare makes you the mayor of a venue if you are the person that checks in the most. Yelp will make you the “Duke” or “Duchess” of a venue for doing the same thing.