Social-media tools are making it a lot easier for users to be savvy online shoppers. Cheaptweet.com uses an algorithm to mine Twitter feeds for deals on clothes, electronics and services. Social shopping also is enhancing the shopping experience by providing greater feedback on how tight a shoe fits, for example. "People are trying to save any penny they can, and social media allows us to share that information openly," says a Cheaptweet.com executive.

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