
Research firm eMarketer estimates that more than half of adult internet users in the US were logging on to Facebook at least once per month at the end of last year. In 2011, the company forecasts that 132.5 million US web users will use the site monthly. Twitter, it adds, will enjoy faster growth rates in the near future but continue to attract ‘relatively few’ online Americans.
An increase of 13.4 percent in the number of users would mean Facebook will reach almost 9 in 10 social network users and 57.1 percent of Internet users this year.
By 2013, eMarketer estimates 62 percent of Web users and almost half (47.6 percent) of the overall US population will be on Facebook.
Twitter, in contrast, was used by 16.4 million US adults, or 9% of the adult internet population, at the end of 2010. eMarketer expects growth to surpass 26 percent in 2011 as Twitter reaches 11% of Internet users and 16.5% of adult social network users in the United States. By 2013, eMarketers forecasts nearly 28 million Americans will be tweeting.
The estimates are based on analysis of survey data and visitor statistics from over a dozen sources, and include US users who use any Internet-enabled device to access their Facebook and/or Twitter accounts at least once a month, including access through third-party apps.
Also see: Global Ad Spending On Facebook Will Reach $4B By Year’s End


Facebook is the world’s largest social network, with over 1 billion monthly active users. Facebook was founded by Mark Zuckerberg in February 2004, initially as an exclusive network for Harvard students. It was a huge hit: in 2 weeks, half of the schools in the Boston area began demanding a Facebook network. Zuckerberg immediately recruited his friends Dustin Moskovitz, Chris Hughes, and Eduardo Saverin to help build Facebook, and within four months, Facebook added 30 more college networks. The original...
Created in 2006, Twitter is a global real-time communications platform with 400 million monthly visitors to twitter.com, more than 200 million monthly active users around the world. We see a billion tweets every 2.5 days on every conceivable topic. World leaders, major athletes, star performers, news organizations and entertainment outlets are among the millions of active Twitter accounts through which users can truly get the pulse of the planet.
eMarketer aggregates digital marketing and media research, providing clients with reports, analysis, charts, articles, interviews, case studies, videos and more.
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