Americans who use Twitter are more likely than the average adult to be highly active on the Internet and in their communities, according to new survey by Gfk MRI.

The survey found people who use Twitter are highly active when it comes to blogging, video sharing and posting reviews. They are 506% more likely than the average U.S. adult to write a blog, 451% more likely to upload or add video to a Web site, and 314% more likely to post a comment or review on a blog, online forum, message or bulletin board. These active Internet users are also 269% more likely to own an electronic book reader.

In addition to being active online, Twitter users are also socially and politically active. For instance, they index highly for all 17 of the public activities measured by GfK MRI. They are 209% more likely to have written something that has been published, 142% more likely to participate in environmental groups/causes, 141% more likely to be an active member of any group that tries to influence public policy or government, and 103% more likely to have attended a political rally, speech or protest in the last 12 months.

'GfK MRI data clearly indicate that Twitter users are an influential group of people, engaged in a variety of public activities, and willing to share their thoughts through blogging and published works," said Anne Marie Kelly, SVP, Marketing and Strategic Planning at GfK MRI.

"This group of people is also probably interested in finding that next big trend, as illustrated by their higher-than-average ownership of electronic book readers."