https://www.cnbc.com/2018/04/14/how-facebook-ads-target-you.html

If you want to tailor a Facebook ad to a single user out of its universe of 2.2 billion, you could.

Trying to pitch your boutique bed and breakfast to a 44-year-old "trendy mom" who lives in Seattle, leans conservative and is currently traveling in the Toronto area but hasn't booked a hotel for the night yet? Go right ahead. Interested in mail-ordering pet treats to a 32-year-old cat owner in Madison, Wisconsin who enjoys Japanese food, doesn't like pizza and has an anniversary coming up in the next two months? Not a problem.