Twitter@5: How well do you know Twitter?

It's been five years since Jack Dorsey, co-founder of Twitter, sent out the very first tweet. In these five years Twitter has evolved from being a 140-character idea to a phenomenon. The who's who of the world are on Twitter and a billion tweets are being sent every week. Chances are you too are on Twitter, but the question is how well do you know the microblogging sensation and the trivia surrounding it. Take a small quiz to find out for yourself.