The Pew Research Center has released "11% of Americans Don't Use the Internet. Who Are They?" by Monica Anderson et al.
Here's an excerpt:
A third of non-internet users (34%) did not go online because they had no interest in doing so or did not think the internet was relevant to their lives. Another 32% of non-users said the internet was too difficult to use, including 8% of this group who said they were "too old to learn." Cost was also a barrier for some adults who were offline—19% cited the expense of internet service or owning a computer
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