Link harvest: FB allows advertisers to target using Personal Information

[osewalrus]

the latest in targeted advertising. Traditionally, you target based on attributes ("single mothers who are left-handed and drive Volvos"). But FB will now let you target a specific person or individuals. So if you own a mailing list or phone list, you can target these folks specifically via FB.

This also, unfortunately, creates some vulnerabilities allowing third parties to de-anonymize information.
https://blog.acolyer.org/2018/07/03/privacy-risks-with-facebooks-pii-based-targeting-auditing-a-data-brokers-advertising-interface/