Here’s a compilation of recent stats on Twitter’s U.S. traffic growth…

Excerpted from Journal of the American Society for Information Sciences and Technology by Penn State Live:

• “20 percent of the tweets contain requests for product information or responses to the requests, according to Jim Jansen, associate professor of information science and technology in the College of Information Sciences and Technology (IST) at Penn State.”


• “With about six million active users daily and predictions of more than 20 million users by the end of the year.”

More on Live.PSU.edu here.

eMarketer reports on US Twitter usage surpassing estimates:

In 2009, there will be 18 million US adults who access Twitter on any platform at least monthly. That represents a 200% increase over 2008 levels. Usage will reach 26 million US adults in 2010, a further 44.4% climb.

“This forecast counts 11.1% of Internet users as Twitter users this year, a figure close in line with Harris Interactive and Pew Internet & American Life Project estimates of 13% and 11%, respectively, in spring 2009. In 20