How Your Likes Are Turning Facebook Into the 'Loyalty Card of the Internet' Brands Such as Levi's, Urban Outfitters Are Using the Clicks of Approval to Tailor Marketing, but Will They Scare Consumers? NEW YORK (AdAge.com) -- Facebook has been collecting thumbs up on everything from Levi's black denim leggings to Sarah Palin videos since April. But where do all those clicks of approval go? And when