In just over 12 months, tablet ownership has expanded beyond the early adopter set to include nearly all population groups. To reflect this rapid growth in tablet adoption and purchase intent over the past six months, eMarketer has raised its estimate for the number of tablet users in the US. The new forecast projects that the triple-digit growth seen in 2011 will carry through 2012, fueled primarily by the popularity of Apple’s iPad and Amazon’s Kindle Fire, as well as by an expanding selection of low-priced tablets. eMarketer projects more than 20% of US consumers—nearly 70 million Americans—will use a tablet by year’s end, and in three years’ time half of all internet users will be armed with them. Read the rest at eMarketer.