Ads, by their very nature cannot be personalized. Unless they are being generated on the fly by some very clever AI, all you're getting is an ad that targets you as part of a group. And you can be lumped into that group pretty much willy-nilly, because of ONE data-point.
For example. I am on Facebook. My status is SINGLE. Yet, I have made very clear on my posts, and me NOT liking "match.com" and other dating sites ads, that dating sites are all scams. I've tried at least 75% of them and they all suck. In fact, they pretty much did the opposite, they convinced me it wasn't worth my time to even try anymore. And I've made that CLEAR via many Facebook posts.
However, Facebook doesn't read my posts; all they need is to see that my status is SINGLE, and I'm inundated with dating site ads. Because of that ONE data-point, I'm lumped into a group that gets served that ad for that product.
Nothing about it is "personalized" and I doubt it will ever be because no "product" exists for single guys who believe that dating sites are a scam and a waste of time. And therefore, I am served the ad that comes in as the closest match given Facebook's limited set of advertisers.
Other things facebook should know about me but doesn't, is my interest in vintage volkswagens. But no such advertisers exist for facebook, so it ignores this data-point entirely.
The point is that people are too diverse to ever have truly targeted advertising.