3. Simon Pegg
Simon Pegg is awesome. There's no other way to describe him. But that's not the reason we love him per se - oh no, we love Simon Pegg because Twitter has shown what a genuinely, warm hearted all round nice guy he is even when he's goaded into pointless arguments about trivial matters by other Tweeters (see his war of words with @indeedemma). He's just a normal guy who happens to be an uber famous geek with legions of die hard fans and celebrity best mates. He also knows Tom Cruise, but don't hold that against him.
Typical Tweet: "Working out in the Elstree Studios gym, the bench press is set at 120K. I guess the last person to use it was Chewbacca"