I think you should make all major publishers responsible for the content they present, and we actually do for news papers in Denmark. It's illegal for them to lie, and their editorial staff is held responsible. It's a little more complicated than that one line of course, and it's governened by an independent free speech party.
The manipulation that goes on on facebook and similar platforms would be illegal in our news papers, and it's exactly because we have a history of mass manipulation damaging society that we have those laws.
They've just not caught up to the modern platforms yet.