From Mashable.com:
“Our mission is to be everywhere our Cardmembers and merchants are,” says Leslie Berland, SVP of digital partnerships and development. “To engage with them, service them, deliver unique value that’s shareable and create seamless digital experiences that surprise and delight.”
Operating on LinkedIn, Foursquare, YouTube, Google+ and Facebook, American Express has found that social media is an effective channel for communicating with their customers, whether that means publicizing offers or receiving complaints. Amex Sync, for example, allows users to register for deals by syncing their card with Facebook, Twitter, or FourSquare. The deals are redeemed when the customer pays with their card and they receive a credit on their next billing statement.
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