4Food Burger restaurant combines serving food and social networking game.

Starting next month, people in New York City will be able to built their own burger, give it a name and maybe if their creation is copied by enough people, earn credits towards free food eventually. The concept is derived from social network games and is the creation of a new restaurant called 4Foood who billed itself as a hyperconnected , "healthy fast food."
The process begins when someone go to 4Food.com and start building their own burger from a list of options like the type of bun, meat and condiments. After placing their orders, customers can give it a name, broadcast their creations on social network sites like Twitter, Facebook or Foursquare to help it make it become popular, and go pick-it-up. The names of the different creations will appear on a leaderboard where the creations are ranked by the most ordered. That's where the concept is turned to a social network game with each new order of one creation, earning the author 25 cents credit in the restaurant and making his or her creation move up the leaderboard, which translates to more credits.
The restaurant is slated to open on 40th and Madison and will have a seating area very accomoding for the plugged crowd with free Wi-Fi.

For more, see NewYorkTimes.com