22. Harry Styles, Musician
Cherubic boy band member with few Twitter inhibitions. His followers – nearly 2 million of them – get to share in everything from behind-the-scenes pictures of One Direction to celebrity gossip, flirtations ("I definitely fancy Rihanna") and embarrassing incidents ("The awkward moment when your mum walks past the shop at dinner time and the whole of One Direction (not including me) start shouting MILF. Grr.") His fans can't get enough of it – and nor, it seems, can he.
Tweets as: @Harry_Styles PeerIndex: 80 Authority: 78 Activity: 30 Audience: 97 Follows: 728 Followers: 2,140,228Follow @Harry_Styles