Beauty-themed social networks such as Pampadour.com, SheSaidBeauty.com and Bloom.com give cosmetics buyers and professionals a chance to see the latest trends in makeup and upload photos of their own looks. And they are boosting sales, say experts. "Originally when customers started shopping online, they were buying for replenishment," said Donna Barson, a senior associate with market-research firm Kline and Co. "Now they are trying things they've never tried before."

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