In the crowded world of location apps like Foursquare and Facebook Places, Google Latitude aimed to differentiate itself from the rest of the pack. Unlike the others which center around checking into places by tapping an icon, Latitude always tracked where you were in real-time, without any user interaction needed. Then it would share your whereabouts with your friends as you moved around. Thing is, people like checking in. So Google went ahead and added the ability to check in on Latitude, which will allow more flexibility for users of the app. A more interesting feature in Latitude is you can even choose to be automatically checked into locations, which sounds fairly ridiculous given how close many spots are to each other.