Is the manufacturer of a megaphone responsible for the words spoken into it?
That's not really a good analogy Mule. Take Youtube for example. If Pedo Bob posts a Chris Hansen "Have a seat" pedo video, and Youtube does nothing to take it down, then yes, Youtube can be held responsible for allowing it.
If I write a letter to the editor of a newspaper, and the letter is not put into print, can I sue? That's censorship by a private entity. And heaven forbid that they print a letter to the editor that is exactly counter to the opinion expressed in mine. Come see the oppression inherent in the system!
What if you're black, like country, and they don't print the letter because your black? Can you sue then?
Maybe we will eventually see political class established as a protected class like we do race, religion, etc.