I feel really weird typing Mars, NASA, social networks and check-in all in the same sentence, but here we are. NASA have announced that their Curiosity rover had "checked in" on Mars through Foursquare.
This has given NASA the bragging rights of checking in from an entirely different planet, and will use the location-based social network to share updates and pictures whilst roving around on Mars. Now all the space agency has to do is become the Mayor of Mars, and they'll be one step closer toward being a true, space hipster.
In space, no one can hear you check-in, or can they?