U.S. President Barack Obama, who already has a Twitter and Facebook account and held town meetings on both, increased his social graph even further by joining FourSquare this week. FourSquare is a social network based on geographical location that also uses elements of gaming.  Members “check-in” at locations with their smartphone or via text message, and are awarded points based on the venue.
 

President Obama joines FourSquare

President Obama will be using the new White House …