The US basically does. The government never censors the Internet; producing child pornography or running an illegal gambling site may be illegal, but there is no filter on Google to prevent you from finding those things. Terrorism, anti-foreign feelings, racism, government subversion, ethnic separatism, etc., are reprehensible, but are protected speech here. The government could find itself in trouble if it prevented someone from publishing something about one of those topics ("prior restraint"), and has lost many cases where it has tried to remove this information after the fact.
Basically, anything goes except libel, obscenity with no cultural value, and speech to incite imminent lawless action.
So basically Xinhua, get a clue. China is the outlier.