Pinterest users have liked, pinned or otherwise referenced H&M 145,000 times in the past month, but many of the pins lead users to popular styles that are no longer available. It's a common issue for retailers using the image-driven social site, says Curalate CEO Apu Gupta. Curalate, and another company called Pinfluencer, have developed tools to refer users to other products when they hit upon something that's out of stock.

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