Maybe. Or it could be something else. You don't need an account at a store to be tracked, they can track you using a credit card. Here's an interesting story about a father who was upset his daughter was receiving maternity coupons: https://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/?sh=fd3943c66686 Don't use Amazon though.