Iran uses one of the most extensive technical filtering systems in the world .by using this strong system they can to block the foreign blogs and social network such as face book and etc. All internet traffic in and out of Iran travels through one portal the telecommunication company of Iran (TCI) though a few service providers operate below it .this make it easier to monitor traffic. And also decisions on blocking are made by a committee of government officials .in Iran filtering is done by the telecommunication ministry ."The authorities can filter a new website within 24 hours," said Mahmood Enayat, an Iranian expert at the Oxford Internet Institute. "They monitor very intensively. It's not really that sophisticated as they use domain names rather than key words, but that's still enough to stop users' access."
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