What do Starbucks, the NASCAR Hall of Fame, and an intersection on Independence Boulevard have in common? They are all places I have checked into on Foursquare – the location based social networking website (or app) that every remembers better as their favorite elementary recess game. Marketers can add their businesses on Foursquare so users can check-in during their visit and share tips & photos. Does your brand not have a physical location? No worries, there are also marketing tips for those brands as well. As with any location based social network; just because you are there…doesn’t mean you necessarily should check-in there.