On Christmas Day customers bought more electronic books than hard-copy books on Internet retail giant Amazon.com

Amazon also said that its e-book reader, the Kindle, "has become the most gifted item in Amazon's history."
The Kindle also faces competition from the "Nook," a new device sold by US bookstore giant Barnes & Noble. The company said it sold all of its Nooks one month before Christmas, and that the next shipment will not be available until early January.


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