Facebook is completely different from cable news. Nothing in history has encompassed marshall mcluhan's idea of the global village quite like modern social media has. The grip that Facebook has on our central nervous system is unparalleled and we talk about it in terms of "fairness" and "representing viewpoints" and not "biologically, neurologically, how is this technology fundamentally changing what it means to be a human being".
I don't know how to pass legislation to do so, but I believe it's in our best interests, as a society, if the maximum natural size of a website is like, 100k users, MAX. With the diversity of communities available, fairness of moderation will no longer be as important because you have more alternatives than the billionaire consensus factory