Taco Bell recently offered free tacos to its 6 million Facebook fans, but the no-strings-attached offer received remarkably few takers. Only 3% of the earmarked free tacos were ultimately given away, prompting the company's soul-searching over the future of Facebook commerce. "We haven't even been able to give away the food, never mind figure out how to sell it online," said Jonathan Blum of Taco Bell's parent company, Yum! Brands.

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