Social media is important, but it does not bring down governments. Governments can shut down the Internet. Governments can control media access. If they do what the Tunisians did and try and negotiate with the opposition, then the media's still open, the international community can learn what's happening in the country, and then that can provide inspiration. But in mid-2009, the Iranian regime just shut down the Internet. Facebook went dark. Twitter went dark. BBC Persian, Voice of America, Persian News Network all went dark. That was it.