Coca-Cola sent a crew of "smile starters" around the world to reward those who smiled back with a Coke or other prizes, including sunglasses and bicycles. The results of the campaign are captured in a new 2-minute video Coke posted to YouTube. "I think what is so powerful is that the majority of people did smile, and they were all strangers. None of it was set up," said Coke's AJ Brustein.

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