I've wondered when something like this will pop-up. Cursor just doesn't lend itself very well to interactive data work. I actually even tried to put together something similar myself over Christmas break as a PoC: https://github.com/demirev/radian
4 karma · joined January 19, 2018
Plus the approach you outlined would require the user to like/dislike things based on the add they saw, so CA can observe a change in the predicted affiliation (they didn't have access to posts as far as I know). I don't think it would have that effect (even if the add influences you, I doubt that it would make you go unlike Obama's page for example). Not to mention that by any likelihood you shouldn't be able to verify that a particular add was shown to a given individual.
I suspect it was a simpler use case - they would group users into segments, and then craft different add strategies for each one (maybe based on other research or just expert opinion).