VIC Consulting Twitter Analytics - http://www.vicconsult.com/twitter-follower-statistics-reports-analytics/
Followers/Following Ratio Users
less than 0.5 151
between 0.5 and 1 708
between 1 and 1.5 362
between 1.5 and 2 29
between 2 and 5 37
more than 5 3