9. Derren Brown, Illusionist
Don't assume that, just because he follows only 29 people, Brown is a half-hearted Twitter enthusiast. In fact, there is an infectious enthusiasm about his regular updates, witty, interesting links and personal snippets about musical tastes (Bach) or public transport etiquette (don't bark into your mobile phone). The combined effect is a celeb Twitter account that's well above the average in that genre. And the master of illusion is generous, too: to celebrate his millionth follower in January he ran a Twitter-based competition whose winner would be whisked off for dinner with a friend at The Ivy.
Tweets as: @DerrenBrown PeerIndex: 89 Authority: 91 Activity: 43 Audience: 93 Follows: 29 Followers: 1,062,416Follow @DerrenBrown