Amazon reports Q3 ad revenue up 11% YoY to $19.64B, vs. $20.82B est., and subscription services revenue up 11% YoY to $14B (Annie Palmer/CNBC)

Annie Palmer / CNBC:
Amazon reports Q3 ad revenue up 11% YoY to $19.64B, vs. $20.82B est., and subscription services revenue up 11% YoY to $14B  —  Amazon shares plunged more than 7% in extended trading Thursday after the company reported earnings and revenue for the third quarter that fell short of Wall Street's expectations.