82% of twitter users have fewer than 100 followers

"82% of Twitter users have less than 100 followers
81% of Twitter users are following less than 100 people
Thursday and Friday are the most active days on Twitter, each accounting for 16% of
total tweets in our study.
10-11 pm is the most active hour on Twitter, accounting for 4.8% of the tweets in an
average day."
Source: Pg 6 of State of the Twittersphere report, Hubspot, January 2010
Note - the report is based on analysis of 6m tweets from 5m twitter accounts.
Note 2 - the report also states that 'the average twitter account has 300 followers, and follows 173 other accounts'. This is clearly an arithmetic mean (naughty of them to use 'average' without explanation), and shows that the mean figures are heavily skewed by celebrity users with over 100,000 at one end.