Although most U.S. adults have become part of the online world, nearly one-third of them (32 percent) remain unconnected, some by choice, according to a study by the Pew Internet and American Life Project, reports the AP. Only a third of nonusers cite lack of access as the reason for not using the internet; others say they are too busy or consider it too difficult or expensive.

Another third say they simply don't want to go online (even though 15 percent of that one-third live in households with a connection).

Some 78 percent of those age 70 and older are offline, compared with less than half of the 60-69 group and less than a quarter of all adults under 70.

Other demographic groups that tend not to go online as much are African-Americans, people without high school education, and those without a child living at home.