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"If you've ever found yourself just shy of enough rewards points on your credit card to let you actually do something with them, Citibank might have an interesting option for you. The ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2012/01/03/citibank-is-using-a-facebook-app-to-let-you-pool-your-rewards-points-with-others/>