This is cool. I love that NASA has a sense of humour.

The Curiosity Rover checked in to Mars on Foursquare yesterday tweeting,

"One check-in closer to being Mayor of Mars! (@ Gale Crater)"

How cool!?

If you want to follow the lil guy it's @marscuriosity

He's already got 1.2 million followers and tweets some really cool stuff.