Some ads already have that much info about you if you're being advertised to because of retargeting/remarketing. Eg when you bail from a site with something in

Some ads already have that much info about you if you're being advertised to because of retargeting/remarketing. Eg when you bail from a site with something in your shopping cart and that item follows you around the internet. That said, this is a great reason not to browse the internet with logged in google email. That was always the flaw in the firefox 3rd party cookie blocking debacle: it would have been an enormous gift to fb, google, and twitter.