Over the past few months, Twitter has experienced explosive growth, attracting celebrity users such as Oprah, and a growing mountain of media and blog coverage. Sysomos Inc., one of the world's leading social media analytics companies, conducted an extensive study to document Twitter's growth and how people are using it. After analyzing information disclosed on 11.5 million Twitters accounts, we discovered that
+ 72.5% of all users joining during the first five months of 2009
+ 85.3% of all Twitter users post less than one update/day
+ 21% of users have never posted a Tweet
+ 93.6% of users have less than 100 followers, while 92.4% follow less than 100 people
+ 5% of Twitter users account for 75% of all activity (see the report on analysis of top-5% users)
+ New York has the most Twitters users, followed by Los Angeles, Toronto, San Francisco and Boston; while Detroit was the fast-growing city over the first five months of 2009
+ More than 50% of all updates are published using tools, mobile and Web-based, other than Twitter.com. TweetDeck is the most popular non-Twitter.com tool with 19.7% market share.
+ There are more women on Twitter (53%) than men (47%)
+ Of the people who identify themselves as marketers, 15% follow more than 2,000 people. This compares with 0.29% of overall Twitter users who follow more than 2,000 people.