As Facebook continues to solidify its role as the world's top social-networking site, eMarketer estimates that more than half of U.S. Internet users were logging on to the site at least monthly by the end of 2010. This year, the number of U.S. Internet users who visit the site regularly will increase 13.4% to 132.5 million, eMarketer forecasts. That means Facebook will reach almost nine in 10 social-network users and 57.1% of all U.S. Internet users. To find out more about eMarketer's coverage of social networking, click here.
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