The computer savvy in Iran can't surf the web or google their competitors today. The country announced today that it is going to create its own little internet universe so that Iranians cannot access certain international sites. http://www.engadget.com/2012/09/23. The plan is for the isolation of their citizens to be finished by next Spring.
Some people would be quick to blame the YouTube video referenced by Obama associates as the cause of the 9/11 rioting in the Middle East but the Iranian government is silent on the real reason it has taken this step. The government plans to filter all social networks and email addresses until further notice. This new ban will be immediate.
With Ahmadinijad in New York for the United Nations meeting, perhaps his plan is for his countryment to be unable to access anything that may happen her that he would rather they did not see. No one knows if the plan is for this new restricted network to totally replace the world wide net.
Iran is just another in a group of countries such as China, Korea that intend to keep its countrymen in the dark about its international associations and television appearances where its leader has no problem saying it intends to annihalate Israel or anyone else that gets in its way. Censorship is a big step in isolating a nation at odds with world views.