FB (and to a lesser extent google) allow targeting via phone numbers, emails, and addresses. This [1] shows the attributes Facebook Custom Audiences allows mat

FB (and to a lesser extent google) allow targeting via phone numbers, emails, and addresses. This [1] shows the attributes Facebook Custom Audiences allows match on, and it includes email, phone, first/last name, address, dob, and age. So if any of those were shared with the store, they can upload them to FB (and very similar to Google) to show you ads. [1] https://www.facebook.com/business/help/2082575038703844?id=2469097953376494 https://www.facebook.com/business/help/2082575038703844?id=2...