Fake Twitter Followers Become Multimillion-Dollar Business

http://bits.blogs.nytimes.com/2013/04/05/fake-twitter-follow...

Over 27% of the Top 10 Twitter Accounts’ Followers Are Fake

http://www.webpronews.com/over-27-of-the-top-10-twitter-acco...

5% of Twitter Users Are Fake [reports Twitter in S-1]

http://investorplace.com/2013/10/5-of-twitter-users-are-fake...

edit: 1 in 10 Twitter accounts is fake, say researchers

http://www.nbcnews.com/technology/1-10-twitter-accounts-fake...