Twitter Use (and Projections)

Fewer Than 20 Million US Adults Used Twitter At Least Monthly in 2010. (eMarketer, 2/24/2011)

Excerpt: Although Twitter’s growth rates continue to rise, relatively few online Americans use the microblogging service. According to new estimates by eMarketer, 16.4 million US adults, or 9% of the adult internet population, used Twitter at least monthly in 2010. Growth will surpass 26% this year as Twitter reaches 11% of internet users and 16.5% of US adult social network users. By 2013, nearly 28 million Americans will be tweeting.

Related articles:
Update on Library of Congress Twitter archive.  (1/25/2011)
The evolution of Twitter usage.  (1/5/2011)
Pew Research asks, "Who tweets?"  (12/9/2010)
Twitter:  Survey says.... (5/15/2010)
Lance Ulanoff on Twitter:  "It's about information, not socialization".  (5/4/2010)
Billions of 'in-the-moment' pieces of history.  (5/2/2010)
Library of Congress acquires Twitter archive.  (4/14/2010)
TV + Twitter = Mystery Science Theater 3000.  (3/15/2010)
Business website profiles 6 Twitter types.  (12/14/2009)