Burger King Whopper Sacrifice
Oh, look, Burger King is making another appearance on this list. The company came up with an ingenious promotional campaign back in 2009: Anyone who deleted 10 friends from their Facebook profile would receive a free Whopper. This campaign actually worked liked a charm, as most Facebook users have plenty of “friends” on Facebook they’d gladly sacrifice for free food. The promotion was cut short, though, when Facebook appealed directly to Burger King. It turned out that so many people were culling their friends list that Facebook was losing a lot of money in advertising data.