About 15 percent of U.S. adults do not use the internet, a new Pew Research Center analysis of survey data reports. In the year 2000 almost half of Americans did not use the internet, but that rate of conversion has slowed the past three years, the survey reports. A 2013 Pew survey found three reasons people do not use the internet: no interest, too difficult to use, and too expensive. Younger americans, and those that live in urban areas, are more likely to use the internet, the survey found.