Internet adoption among U.S. adults increased rapidly from the mid-’90s to about 2005. Since then, though, the number of adult Internet users has remained almost stable at around 75 to 80%. The Pew Internet & American Life Project’s latest poll shows that this trend continued in 2011. Those who are online use the Internet more than ever before, but about one in five U.S. adults is simply not online.
According to this report, “senior citizens, those who prefer to take our interviews in Spanish rather than English, adults with less than a high school education, and those living in households earning less than $30,000 per year are the least likely adults to have Internet access.” Age, household income and education have remained the strongest positive predictors of Internet use since Pew started tracking these numbers.
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http://techcrunch.com/2012/04/13/report-one-in-five-u-s-adults-does-not-use-the-internet/