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"Sony Ericsson has partnered with location-based social networking service Foursquare to make the first Tennis 'Grand Slam' tournament of the year in Miami - the US Open - the first ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/mobile/2011/03/14/sony-ericsson-open-to-become-first-fully-foursquare-integrated-sporting-event/>