30. Davina McCall, Broadcaster
The former Big Brother presenter – who describes herself on Twitter as "wife, mother, friend and TV presenter" – tweets prolifically on everything from showbusiness to the minutiae of daily life. A series of tweets about being snowbound on the A21 for some reason made national headlines in 2009. More recently, she has tweeted furiously about the French red tape that has frustrated (so far) her attempts to row across the English Channel for Sport Relief.
Tweets as: @thisisdavina PeerIndex: 75 Authority: 73 Activity: 18 Audience: 93 Follows: 348 Followers: 1,055,732Follow @ThisisDavina