It seems that you do not need to be on earth to enjoy social media, as a NASA astronaut has managed to check-in on Foursquare and earn his NASA Explorer Badge. He is the first person to do this from space, and will no doubt be the last.
Commander Douglas H. Wheelock was aboard the International Space Station at the time, would have been way cooler if he had did this while doing a space walk. This is a new badge available on Foursquare, and future space travelers will make it their mission to earn this badge.
However, you do not have to be in space to unlock the badge, Foursquare and NASA has placed badges at a number of locations in the U.S. A fine example this is the Smithsonian National Air & Space Museum — where else?