Foursquare confirms 20M users, 2 billion check-ins, on 4sqDay 2012
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.
Anyone who makes a check-in on the service today will …



















