Today, the third annual 4sqDay (April 16, four-squared, get it?), check-in king Foursquare confirmed that it has reached new milestones of 20 million users and a whopping 2 billion check-ins.
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Foursquare surpassed 15 million users back in December, and in March founder Dennis Crowley said it was close to 20 million users.
Siehe zu Foursquare auch meine längere Analyse: Foursquare ist auf dem Weg zur ersten großen mobilen Plattform
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