When one hears that China controls the internet in its country, fear rears its head. The First Amendment of the US Constitution does not have separate lines drawn for different circumstances, for the problem with censorship arises from who is conducting this censorship. As Larry Flint said at his trial for pornography, "If the First Amendment will protect a scum--like me, then it will protect you."
No line can be drawn in the proverbial sand on censorship; for, another line can be then drawn, and still another, and another, and eventually, there will be no free expression. The forefathers of America were of a breed unknown now; they foresaw many of the problems that would occur in the country; however, they wisely sought to define well the rights of the citizens of this country.