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"If you've ever been to the city of New York during the past five years, you'll know that cab drivers don't always give off a warm and cuddly feeling. This was especially true for short ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/shareables/2012/05/14/how-3-simple-buttons-raised-tipping-by-144-million-in-nyc-cabs/>