4M Users Check In to foursquare

foursquareLogo2.jpgChecking in is the in thing, as foursquare co-founder and CEO Dennis Crowley told GigaOM the location-based mobile app topped 4 million users.

foursquare reached 1 million users in March and 3 million in August, according to GigaOM, and Crowley said it took just 50 days to go from 3 million to 4 million.

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