Top of the class: Twitterers by profession

THE TOP SHOWBUSINESS TWEETERS

1. Eddie Izzard (PI: 89)
2. Stephen Fry (88)
3. Russell Brand (79)
4. Tinchy Stryder (78)
5. Graham Linehan (74)
6. Imogen Heap (72)
7. David Mitchell (67)
8. Robert Llewellyn (66)
9. Jimmy Carr (65)
10. Simon Pegg (64)

TOP TWEETING SPORTS STARS
1. Rio Ferdinand (PI: 68)
2. Ian Poulter (61)
3. Michael Vaughan (49)
4. Jack Wilshere (48)
5=. Kevin Pietersen (36)
5=. Andy Murray (36)
7=. Andrew Flintoff (32)
7=. James Anderson (32)
9. David Haye (27)
10. Rohan Rickets (16)

TOP BUSINESS TWEETERS
1. Umair Haque (PI: 80)
2. Duncan Bannatyne (72)
3. Lord Sugar (71)
4. Tim Harford (69)
5. Robert Peston (65)
6. Lucy P Marcus (63)
7. Theo Paphitis (60)
8. Martha Lane Fox (56)
9. Peter Jones (55)
10. James Caan (26)

TOP FASHION TWEETERS
1.Hilary Alexander (PI: 76)
2. Sasha Wilkins (64)
3. Susanna Lau (61)
4. Mary Portas (58)
5. Lorraine Candy (37)
6. Melanie Rickey (33)
7. Lucy Wood (32)
8. Louise Gray (26)
9. Brix Smith Start (18)
10. Jane Bruton (14)

TOP SCIENCE TWEETERS
1. Ben Goldacre (PI: 70)
2. Richard Dawkins (68)
3. Brian Cox (66)
4. Roger Highfield (65)
5. Karen James (64)
6. David Bradley (62)
7. Dr Evan Harris MP (57)
8. Marcus du Sautoy (36)
9. Lord Paul Drayson (34)
10. David Nutt (33)

TOP POLITICAL TWEETERS
1. Sarah Brown (PI: 93)
2. Johann Hari (69)
3. Krishnan Guru-Murthy (67)
4. Paul Staines (66)
5. Paul Waugh (65)
6=. Sunny Hundal (64)
6=. Boris Johnson (64)
8. Paul Mason (60)
9. Charlie Beckett (59)
10. Alastair Campbell (57)