Amazon's Kindle Fire tablet had solid holiday sales, shipping 3.9 million units in the final three months of 2011 and placing it second in sales behind Apple, which sold 18.6 million iPads in the same quarter, according to IHS iSuppli. Looking ahead, eMarketer predicts that 54.8 million Americans will own tablets by the end of this year, up from 33.7 million at the end of 2011.

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