American Express is looking to trump Facebook and Discover's Facebook Card with an enhanced alliance with Twitter that allows cardholders to make purchases directly from their Twitter accounts. American Express has used the same Card Sync technology to offer special deals, rather than direct purchases, through Twitter, Foursquare, Xbox Live and Facebook, since 2011. The program is launching with a variety of tech products for sale, such as a Microsoft Xbox 360 or an Amazon Kindle Fire HD.

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