The front desk of the Amazon office is pictured in New York, May 1, 2019.
Carlo Allegri | Reuters
If you were browsing Amazon in search of deals for Prime Day, you undoubtedly came across a lot of ads. That’s because Amazon has a trove of information about buying habits that makes it a valuable place for advertisers.
Think about it: Amazon knows the last time you bought toothpaste on the site and which brand you typically like to buy. Advertisers can use that information to try to get you to buy their brand of toothpaste right when you’re running low.
Other advertisers can use Amazon to target ads, even if they’re selling products that you can’t necessarily buy on Amazon, like insurance or a…