I don't know how precise the ad targeting exactly, but what if you narrow the base group down to your 19 fake accounts and your target user.
If you could the further filter your ad based on gender (as mentioned above), personal interests or other private data, you may be able to use your ad impressions to figure out things about an unsuspecting person.
If you could the further filter your ad based on gender (as mentioned above), personal interests or other private data, you may be able to use your ad impressions to figure out things about an unsuspecting person.
I'd consider that a huge breach of my privacy.