http://www.pewinternet.org/Reports/2012/E-readers-and-tablets.aspx?src=prc-headline
The share of adults in the United States who own tablet computers nearly doubled from 10% to 19% between mid-December and early January and the same surge in growth also applied to e-book readers, which also jumped from 10% to 19% over the same time period.
The number of Americans owning at least one of these digital reading devices jumped from 18% in December to 29% in January.
