I think you are not taking into account that the knife and the phone are not "mass/broadcast" tools. They are one to one, one to few at most.
Moreover facebook is not a neutral conduit, the algorithmic feed act as an editor for a newspaper (and an editor that can give each person their own personal newspaper at that!)
Moreover facebook is not a neutral conduit, the algorithmic feed act as an editor for a newspaper (and an editor that can give each person their own personal newspaper at that!)