I came across a study that HarvardBusiness.org conducted in May 2009 on the Twittering habits of 300,00 Twitter users, with surprising results.  Perhaps the most interesting and surprising finding is that the top 10% of Twitter users account for 90% of Twitter's content.  This suggests that most Twitter users are not publishers, but are searchers or passive users.  Many Twitter users are on the quest to grow followers, but few have a strategy to monetize.  Many Twitter users are using it as a tool to pull information, turning it into a search engine of sorts. The results of this study should give marketers caution not to invest too much time and energy on Twitter just yet without a proven business case.  It's a great tool for select purposes, but as shown in the study, only the minority of Twitter users are actively engaged to produce meaningful content for everyone else.  I have to admit..., I'm one of those that publishes once every week or so.  You can follow me on Twitter: http://twitter.com/ericdudley If you are in the 90% of people that Tweet daily, what's your purpose, experience and results?  Please comment.