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Simple Check-in For Foursquare - Free Android App
Foursquare checkin
Foursquare's big break: from check-in app to Yelp killer
Swarm App 3.0 - New & Improved Check In App
Foursquare: the startup zombie that still eats your data
CEO Jeff Glueck on Foursquare v. Swarm; city guide v. check-in competition
Foursquare's New Swarm App
SWARM APP BY FOURSQUARE