15 percent of Americans don't use the Internet
, Pew reports. That's slightly lower than the percentage of online adults who use Twitter
, according to research Pew released in August.
About a third of offline people cited usability concerns. That figure has grown remarkably -- "in 2010, for instance, almost half (48%) of non-internet users cited issues of relevance, and only one in five mentioned usability or price-related reasons, respectively," the report says.
The offline figure is almost a mirror image of 1995, when 14 percent of Americans were online.