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Reporting from Cairo -- Footage of burning cars, masked boys and bloodied protesters in Iran is playing across the Middle East, captivating Arab countries where repressive regimes have for years been arresting political bloggers and cyberspace dissidents.

Egypt, Saudi Arabia and other Sunni nations have tense relations with President Mahmoud Ahmadinejad and the Shiite-led theocracy ruling Iran. But they don't want protests in Tehran to inspire similar democratic fervor in their countries -- especially the merging of Facebook and Twitter with a potent opposition leader like Iran's presidential challenger, Mir-Hossein Mousavi.