eMarketer On Social Networking In The US: 57% On Facebook, 11% On Twitter

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% of Internet users this year. By 2013, eMarketer estimates 62% of Web users and almost half (47.6 percent) of the overall US population will be on Facebook.