7 Twitter facts that may interest only me

• 5% of users account for 75% of all activity, and 10% of users account for 86%

• 21% of Twitter accounts are empty placeholders. These are the percentage of Twitter accounts that have never posted a single tweet.

• Nearly 94% of all Twitter accounts have less than 100 followers.

• March and April of 2009 were the tipping point for Twitter. During these months, Ashton Kutcher launched his quest to get to 1 million followers faster than CNN and Oprah started using Twitter.

• 150 followers is the magic number. Twitter users tend to "follow back" all their followers up until about 150 connections. Then the reciprocation rate fell off dramatically.

• Half of all Twitter users are not "active."

• Tuesday is the most active Twitter day. Tuesday stands out as the most popular day for tweets and re-tweets, followed by Wednesday and Friday.