As much as I thought Foursquare was fun personally, it never reached critical mass. It served as an excellent proof of concept for both sharing location info and for "badge" game concepts. Facebook of course has mass... lots of mass. Facebook Places brings location and location based incentives/marketing to bear. More on this as well as a peak at Vail's Epic Mix social/mobile/location RFID tracking platform... wow. Read my post at www.propdave.com

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