I have been repeatedly assured by ad tech experts on HN that Facebook (and Google's) advertisements which are custom-tailored to my tabulated interests are far superior to the ads I would get through traditional context advertising.
You can tell by all the ads I see on Facebook for feminine hygiene products for the lady parts I don't have, the concert ads for bands I don't like, and the restaurant ads for cities where I don't live in places I've never been.
Life is so much better with the ad tech algorithms in charge.
actually my post is not arguing with that, however facing the reality where interest tracking/profiling will become harder or impossible good old context-based ads might at some point become better alternative. Not because they're inherently more efficient but because, with changes like that, interest tracking might become infisible or too resource consuming