Making Lunch a Social Networking Game

4food ordering page

4food.com - ordering page allows customers to customize a burger.

4food leader-boardNick Bilton/The New York Times

The 4Food leaderboard shows the most-ordered burgers. 

Thursday night I had dinner in the future, and the hamburgers were shaped like doughnuts.

Before I get to these strange hamburger shapes, let me explain why they were from the future: my burger was created on the Internet and broadcast to Twitter, Foursquare and Facebook, part of a multiplayer online game, and my order was checked in by a receptionist with an iPad...