You know how there's this sense that if Amazon gets into your line of work, you're in trouble? Well, hello, digital advertising. Amazon has been slowly building up its ad business, letting brands target ads to people on Amazon.com and its other sites, like the live-streaming platform Twitch, IMDB, Zappos and all across the web. Its pitch is simple: Amazon is telling advertisers that the best predictor of what you, the consumer, are going to buy is what you've already bought. A report out today from research firm eMarketer says Amazon has been a distant third behind Facebook and Google and is starting to look like a dangerous third. Host Molly Wood talks about it with Monica Peart, senior forecasting director for eMarketer. Today's show is sponsored by Topo Athletic, Evident and Indeed.