Twittest is a form of the Turing Test for Twitter, asking "are you the twit in twitter?" It's "a playful project for children and adults to explore identity across social networks. Loosely based upon the Turing Test, the game is simple: Can you spot the real students, teachers, celebrities and bots from the fakers by reading their tweets? And can you successfully fake being someone else?"
In Alan Turing's centenary year this is an excellent way of exploring the concept of machine intelligence.