Why You're Going To Sign Up For Foursquare Whether You Like It Or Not(businessinsider.com)
businessinsider.com
Why You're Going To Sign Up For Foursquare Whether You Like It Or Not
http://www.businessinsider.com/heres-why-youre-going-to-submit-to-foursquare-and-groupon-whether-you-like-it-or-not-2010-6#comments
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