The issue about policing Is not "muh private property, people choiche", but about controlling a "public utility" like a nation Wide communication medium. Here the society needs hamper the private business (or monopolization in general) side, Like in journalism, food safety, health services. I would dare say that any social medium that get Mass adoption and can influence massively society needs public oversight & regulation (with good regulators). Facebook & Co. Need to comply as Purdue had to when society realized their shenanigans in a "lasseiz faire" enviroment