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" Foursquare has surpassed the milestone of 20 million registered users. The location-based social network announced the figure to mark its third-annual 4sqDay celebration, also confirming that the service has logged more than 2 billion check-ins since its foundation. Foursquare launched back in 2009, and had attracted more than 10 million users by June 2011. Users that post check-ins today (April 16) will receive the 2012 4sqDay badge with a special message from the company. &amp;quot;In 2010, Foursquare fans declared April 16 4sqDay (4/4^2 - nerds after our own heart!),&amp;quot; it reads. &amp;quot;Two years and two billion check-ins later, you&amp;#039;re still why we get out of bed each day. Thanks to all 20 million of you for making us part of your lives. Happy 4sqDay!&amp;quot; The platform features cross-compatibility with other social networks, including Facebook. Last month, it dropped Google Maps in favour of an OpenStreetMap solution on its desktop service.  Foursquare is available as a free app for mobile devices or via an internet browser. &amp;gt; Controversial &amp;#039;stalker app&amp;#039; pulled from App Store "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tech/internet/news/a376760/foursquare-tops-20-million-registered-users/>