In the social media world, Foursquare has been a hot topic of discussion lately, as well as something of a lightning rod. People seem to either totally love it or totally hate it, with little middle ground. In case you’re not familiar with it, Foursquare is a location-based app that runs on smartphones like the iPhone, Droid, and Blackberry. Unlike some other location-based apps like Yelp that are primarily about reviews and finding specific kinds of businesses you might like … →