The revolution will not be televised; it will be Tweeted.

Twitter is being used as a weapon in the Iranian protests.

If you have read Clay Shirky's "Here Comes Everybody," or merely been paying attention in the last couple years, you know how social networking has enabled quick, low-cost organization which is not limited by geography.

What we are seeing now in Iran is an amplification of that. Not only are Iranians using social networking tools to revolt, but now people all over the world are joining their cause. Not passively, but actively.

When the Iranian government started blocking IM and SMS communications (in an obvious attempt to remove citizens ability to organize), multiple people in different countries create DDOS scripts designed to take down the Khamenei.ir website.

Their message is reflected in the tweets pictured below: "Give us back our communication tools and we'll give your website back."

Many system admins are creating proxy sites to enable demonstrators to post information without being blocked.  Others are setting up VPNs to encrypt traffic out of Iran, to allow journalists to get the message out. People without technical expertise are being encouraged to help obscure the identity of Iranians by changing their Twitter account settings so they appear to be in Iran.

Cory Doctorow has posted a "Cyberwar guide for Iran election" on BoingBoing to educate people how to effectively help the protestors, since many well-intentioned actions are actually counter-productive.

It amazes me that people in the United States right now can not only show support for the Iranian protesters, but actually take action. This is more than simply showing solidarity by making your avatar green or something- it is literally taking action in a battle in which the weapons are information tools.