Facebook's most prominent advertisers have multiplied their buys by 10 to 20 times over the past year, according to the site's chief operating officer, Sheryl Sandberg. The growth comes as major brands step up their efforts to reach the site's half-billion members, she said. The site is also hosting a new application from ShopLocal that entices visitors with weekly coupon circulars like those found in newspapers for retailers such as Walgreen and J.C. Penney.

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