Some in the capital of Tehran are slightly ahead of the curve with the use of Twitter to inform the outside world of events. Cutting off cell phones and the Internet along with jamming satellite signals do not make for a credible legitimate government of Iran.
Cyber Terrorism is real whether it is practiced by governments or crooks trying to steal your identity.
In the case of a government resorting to cyber terrorism brings to mind a quote by Thomas Jefferson.
"I Have Sworn Upon the Altar of God eternal hostility against every form of tyranny over the mind of man."