I always call what you are talking about "silent censorship.'' It is silent because the average reader/viewer does not realize it is going on. Mass media has gotten to where it is today because of this type of censorship. It brings me back to a poster that was hung on the wall of my 7th grade English class which stated , "censorship causes blindness". Good post @intelliguy thanks for the email.
RE: FREE SPEECH -- You've heard the term, but I doubt anyone knows how rare it is anymore.