Though the site adds more and more Yelp-like aspects as time goes on, we all remember that Foursquare's initial appeal was all about "checking in." As if you and your friends weren't excluding people quite enough as it was, you could now let everyone know what they aren't invited to in real time. Really, what's the point of brunching if you can't remind people that they aren't there? In the "celebri-me" culture of social media, Foursquare may well have been the low point. Though we mock Foursquare, it definitely provided us with some of our favorite social media moments. There was nothing quite like watching one of your cool, tech-savvy friends accidentally become the Mayor of a local Dunkin' Donuts or White Castle after checkin in one too many times.