It's been a wild year for Foursquare: A couple years ago, they were nothing more than a odd fad among certain tech-obsessed urbanites. Did you ever think people would get kicks from checking in to locations using their smartphones, the human equivalent of dogs peeing on lampposts? Maybe we're not so different than neighbhorhood mutts checking their pee-mail. We're social creatures. Thus the Foursquare 'splosion. It's illustrated in this rather nice looking infographic that Foursquare produced to toot its own horn. As you can see from the topmost map, Foursquare has really become quite a global phenomenon (though granted, this likely has much to do with people traveling rather than locals checking in). There's even been a check in from North Korea, for God's sake. If that isn't something to brag about, then what is?