Facebook measured "sentiment" and then shown weight loss influencers bullshit ads to teenagers deemed "more insecure about their looks".

Yes it feeds directly into anorexia. And yes, it had that effect.

Education wont counteract these effects, not when the company can put staggering amount of money into A/B testing for maximal impact.

What education will do is show that to the world. Then we might legislate privacy mechanisms that would make this sort of abuse illegal and less likely to occur for all people.