They did in fact mean freedom to be heard by the public, and if you are stopping the public from hearing a message because you don't like it, then you should not be allowed to control any communications infrastructure.
They did in fact mean freedom to be heard by the public...
So then why can't I demand to be televised on all of the networks and published on the front page of every newspaper?
Or were the founders only thinking of the internet when they considered free speech?