A Burger King / Facebook application. De-friend 10 people and they'll give you a Whopper, but the 10 people get notified about what you did.
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http://www.sogoodblog.com/2009/01/07...a-free-whopper
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www.whoppersacrifice.com
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I love it, and I'd fire a bunch of people but its in the US only. Dammit.