Amazon launches Amazon Retail Ad Service to let companies show ads in search results, product pages, and other areas of their site, initially in the US (Annie Palmer/CNBC)

Annie Palmer / CNBC:
Amazon launches Amazon Retail Ad Service to let companies show ads in search results, product pages, and other areas of their site, initially in the US  —  Amazon has turned into an online ad juggernaut in recent years, with brands paying big bucks for premium placement on the retailer’s websites.