42.3% of the U.S. Population Uses Facebook

Facebook and Twitter logos combined into one design

Facebook and Twitter logos

"A new report from eMarketer finds that most adult Americans with Internet access use Facebook at least once a month, and a full 42.3% of the entire American population was using the site as of this month.  

"By contrast, Twitter‘s penetration rate was much lower, sitting at around 7% of the total population and 9% of the Internet-using population, according to the report" (http://mashable.com/2011/02/24/facebook-twitter-number/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+Mashable+%28Mashable%29

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