Is there a limit to Free Speech in Cyberspace?

This is a conditional question. Just like in the physical world the 1st amendment is conditional. People can say whatever they want, to an extent. For example, one would not be able to shout "fire!" in a movie theatre or "bomb!" on a plane. The same concept is applied in cyberspace. However, network administrators have more power online than they do in the physical world. In the physical world, if a person is saying things another person does not like, the other person can do absolutely nothing to stop them. Online however, their words can be deleted, as if they were never said. Free speech is only limited by the people who regulate speech. This is true for all mediums. So some areas of cyberspace promote free speech, and some oppress the idea of free speech.