Making this networks transparent would be a pretty good first step. So, maybe when you see a sponsored FB post or "news" article it will say who is sponsoring (traversing shell companies on a best effort policy), why is it being targeted to you (at least based on which selectors) and how many variants of the ad exist.
> Making this networks transparent would be a pretty good first step.
Making them open and not controlled by corporate interests comes way before this.