Amazon knows what you buy, and it’s building a big ad business from it

SEATTLE: When a chain of physical therapy centers wanted new patients, it aimed online ads at people near its offices who had bought knee braces recently on Amazon. When a financial services provider wanted to promote its retirement advisory business, it directed ads to people in their 40s and 50s who had recently ordered a personal finance book from Amazon.
Read more: https://economictimes.indiatimes.com/small-biz/startups/newsbuzz/amazon-knows-what-you-buy-and-its-building-a-big-ad-business-from-it/articleshow/67618788.cms?source=Snapzu