Amazon chief Jeff Bezos revealed today that eBooks is now a multi-billion dollar category for the company and was up approximately 70 percent from last year. “In contrast, our physical book sales experienced the lowest December growth rate in our 17 years as a book seller, up just 5 percent,” he stated.

Amazon reported its earnings today revealing that the company’s net sales increased 27 percent to $61.09 billion in 2012, compared with $48.08 billion in 2011. In the fourth quarter the company’s net sales increased 22 percent to $21.27 billion in the fourth quarter, as compared to $17.43 billion in the fourth quarter of 2011.

Here is more from the press release: “For the second year in a row, Amazon’s tablet was the most popular item for customers – Kindle Fire HD continued its run as the #1 best-selling, most gifted, and most wished for product across the millions of items available on Amazon worldwide. At year-end, Kindle Fire HD, Kindle Fire, Kindle Paperwhite and Kindle held the top four spots on the Amazon worldwide best seller charts since launch.”