Amazon has reported that its revenue rose in the fourth-quarter of last year by 35% to reach US$17.43 billion, although net income fell by 58% to US$177 million.

During the nine-week holiday period ending December 31, 2011 , Kindle unit sales, including both the Kindle Fire and e-reader devices, increased 177% over the same period last year.

"We are grateful to the millions of customers who purchased the Kindle Fire and Kindle e-reader devices this holiday season, making Kindle our bestselling product across both the U.S. and Europe," said Jeff Bezos , founder and CEO of Amazon.com . "Our millions of third-party sellers had a tremendous holiday season with 65% unit growth and now represent 36% of total units sold."

Amazon added that its Appstore for Android customers nearly tripled in the fourth quarter compared to the third quarter. In addition, customers downloaded more apps from the Amazon Appstore during the fourth quarter than they had during all previous quarters combined.