Having two separate public forums will make it better in some sense, but worse in others. Primarily, everyone will listen only to their own side.
Underlying many current problems is vertical integration – facebook posts belong to facebook, your YWN posts to YWN. Amazon hosts sellers, then analyzes and, allegedly, copies their products. This is same monopoly problem that, existed, for example in late 19th century USA.
Web protocols offered a solution, but social networks build their separate markets over that. Maybe government need to enforce that messages belong to posters; kept in a standard format; and then any network can organize them for the user any way you (consumer) want.