I'm not sure how reliable this is: http://aboutfoursquare.com/foursquares-data-problem/ http://aboutfoursquare.com/foursquares-data-problem/ Every bit of venu

I'm not sure how reliable this is: http://aboutfoursquare.com/foursquares-data-problem/ http://aboutfoursquare.com/foursquares-data-problem/ Every bit of venue data on Foursquare has been entered by users. That has led to a wide variety of problems throughout the system.