Facebook doesn't publish what interest categories and demographics go into their ads (aka you can't click on an ad in FB and see what led to it being shown to y

Facebook doesn't publish what interest categories and demographics go into their ads (aka you can't click on an ad in FB and see what led to it being shown to you). But we're talking billions of dollars a year in ads, of which real estate is a respectable percentage (FB is very good at doing geographic targeting). And you certainly also have these relatively unsupervised and opaque "interest categories" that are being presented to advertisers.