2=. Sarah Brown, Campaigner
The modest queen of tweeting has had to give up the crown she won in the inaugural Twitter 100 last year. But Sarah Brown's pre-eminence remains remarkable: her transformation from Prime Minister's wife to formidable campaigner is almost entirely attributable to her savvy use of Twitter. Her huge and loyal following allows her to make a real differences to causes such as PiggyBankKids – which helps vulnerable children – and the White Ribbon Alliance for Safe Motherhood. At the launch of her book Behind The Black Door last March, she threw a party for followers and spoke of her gratitude to the medium as a channel for promoting her causes. But her real secret is her Twitter persona: she's engaged, friendly and approachable, paying particular attention to people who are also named Sarah Brown.
Tweets as: @SarahBrownUK PeerIndex: 92 Authority: 95 Activity: 47 Audience: 94 Follows: 8,286 Followers: 1,177,823Follow @SarahBrownUK