Here’s an interesting and scary article about how Target was able to determine that a young woman was pregnant before her father did based on purchase data: https://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/
Now apply that to a larger scale: If I’ve just booked a flight somewhere, maybe ads for hotels and rental cars are going to be more interesting to me. Maybe if I just bought a tent, I might want a sleeping bag or a camp stove. Knowing all this means the ads you see are far more relevant that what you see on TV, which means it’s far more likely for you to engage with the ad and purchase the product.
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