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Foursquare's New Swarm App
CNET Update - Foursquare Swarm spinoff puts focus on friends
Foursquare checkin
Simple Check-in For Foursquare - Free Android App
EP13 - “Check In” to the Adoption of Mobility Data with Foursquare
CNET Update - Foursquare's new app forgoes check-ins
Swarm App 3.0 - New & Improved Check In App
CEO Jeff Glueck on Foursquare v. Swarm; city guide v. check-in competition