Bullhorns make the police
To mark the fifth anniversary of the US occupation of Iraq, anti-war protesters in San Francisco used the micro-blogging service Twitter to coordinate their movements throughout the day.
The Direct Action to Stop the War group is using Twitter to text participating mobile phones when volunteers are needed for events at strategic locations around the city, according to Wired.
Organizers typically use walkie-talkies and a bullhorn to coordinate protesters, but those carrying radios are usually the first to be arrested by the police.
The service is free for DASW to use as Twitter is footing the bill to send text messages.
View the group's text log on Twitter.