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This statistic shows a timeline with the number of mobile social network users in the United States from 2010 to 2012. A forecast is also shown for 2013 and 2014. In 2010, the number of mobile social network users in the United States was 39 million. By 2012, this number had more than doubled. Active users are those which have logged into a social network site at least once during the last 30 days.