Foursquare: If you've never used Foursquare, here's how it works: Whenever you go somewhere, like a restaurant or a hot dog cart, or hell, your friend's apartment, you check in. Your Foursquare friends can then see where you've gone, and vice versa. You can even become the Mayor of a place by going there enough! It's weird. It's aggressively internet-y. And now, it looks different: the app's been redesigned to be, in my mind, a bit more sensible. Your friends' activity is now displayed in a more feed-like way, and the whole app just feels… different. Still free.