This is the first significant negative news about Q4 and I wonder if it will be followed with more.

The Seattle-based e-commerce giant on Tuesday said its fourth-quarter revenue rose 35% from a year earlier, but profit plunged 57% as the company continued to spend on warehouses, technology and its Kindle electronic devices. Amazon's operating expenses rose 38% in the quarter from a year earlier.
Now that they sacrificed profits due to the Kindle will the decision pay off for them.

Wonder if there were any impact from the tax nexus issues in states like California?

Amazon's Spending Habit Hurts Profit