Whopper Sacrifice

What would you do for a Whopper? I can't say I'd personally do much, if anything, but apparently a lot of people would kill off their friends. BK just launched Whopper Sacrifice and it's apparently really catching on. It's a Facebook app that gets you to "sacrifice" ten of your friends, and in turn receive a free burger. I can't say I'm enticed, but I'm impressed at how popular it's quickly becoming.