New York, February 1 (FinanceEnquiry.com) - Amazon (NASDAQ: AMZN) stock slumped 8 percent in extended trading despite full-year revenue jumping 41 percent to $48.08 billion and net income soaring 45 percent to $631 million or $1.37 per diluted share. However, operating income dropped by 39 percent to $862 million.

Amazon’s fourth-quarter results showed that sales jumped 35 percent to $17.43 billion against Wall Street’s expectations of $18.2 billion. Net income dropped 58 percent to $177 million, or $0.38 per share which was just double the consensus estimate of $0.19. Kindle unit sales, including the Google Android-run Kindle Fire, were the bright spots in Amazon’s report with a jump of 177 percent over last year. Amazon described the Kindle Fire as the "No. 1 bestselling, most gifted, and most wished for product" on the site.

The 8 percent drop in Amazon stock signifies that investors are jittery as first-quarter guidance indicates that Amazon might see an operating loss between $200 million and an operating income of $100 million, representing a decline of 162 percent and 69 percent respectively. Amazon had predicted the same thing for the last quarter, though it topped its guidance with an operating income totaling up to $260 million. The mobile revolution is rolling with Android leading it and the expansion of mobile devices is set to boom which means that companies like Amazon will ride high on the crest of the revolution.