Hyatt Hotels and Coppertone are among the brands trying out the Postagram system for using Facebook to create mailable postcards, writes Christopher Heine. Hyatt guests, for example, can pick a photo on Facebook and add a 180-character message and address to send the card via the U.S. Postal Service. Hyatt is giving away two postcards per guest as part of the effort, while Coppertone is also using Postagram's mobile application.
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