Burger King gave away free burgers to users who unfriended people on Facebook.
The fast-food giant, which scored a big hit over the holidays with its beef-scented Flame cologne, introduced (2009) a Facebook application with a simple premise: unfriend ten people, get a free Whopper.
Users of the social networking site who add the Whopper Sacrifice application to their profiles are rewarded with a coupon for the sandwich after deleting ten people from their friends' list.
The rejected pals are then served with a notice that they've been burned in favor of a free burger.
The application launched in 2009 and has attracted 16,700 Facebook users.