Users of Google, Yahoo, Facebook, Twitter, Tumblr, Flickr, Foursquare, Skype, Instagram, YouTube, Vine or Pinterest may find it difficult to believe that there are actually 15% of people in US who do not use the Internet.

A small percentage of American adults do not use the internet at all, and another 9% of adults use the internet but not at home. The main reasons they cite for not using the internet are relevance, usability, cost and access.

The tittle of the report is "Who's Not ONLINE?

Asked why they do not use the internet:

34% of non-internet users think the internet is just not relevant to them, saying they are not interested, do not want to use it, or have no need for it.
32% of non-internet users cite reasons tied to their sense that the internet is not very easy to use. These non-users say it is difficult or frustrating to go online, they are physically unable, or they are worried about other issues such as spam, spyware, and hackers. This figure is considerably higher than in earlier surveys.
19% of non-internet users cite the expense of owning a computer or paying for an internet connection.
7% of non-users cited a physical lack of availability or access to the internet.