Think only humans can tweet? Think again; besides the endless array of RSS bots, there's a couple of odd "authors" on the popular microblogging tool Twitter. There's a whole bunch of them, actually: from inanimate objects to robots, plants and animals, it's all there. We've chosen a couple of the most interesting ones.
Space Shuttle Endeavour - actually, most of NASA's hardware tweets; Mars Phoenix has just gotten more attention than most. One of the most interesting is Space Shuttle Endeavour, one of the three currently operational orbiters in NASA's Space Shuttle fleet. It's annoyingly cheery for a big hunk of metal, though.
Ridley - meet Ridley the pug. He likes long walks in the park, ice cream (although he knows it's not good for him) and peanut butter. Oh yes, and he also tweets about it quite often. While you're at it, check out what Ridley's tongue has to say, too.