Excerpt from www.wired.com:

He’s not positive what got the ambulance to the scene, but Atlanta councilman Kwanza Hall’s use of his Twitter on his Blackberry played a roll in despatching emergency services to a woman in need.

“Need a paramedic on corner of John Wesley Dobbs and Jackson st. Woman on the ground unconscious. Pls ReTweet,” Hall tweeted, eschewing the use of his cell phone as, well, a phone, to call 911 since his battery was low and he didn’t want to lose contact if it died while he was trying to save a life.

Several of Hall’s followers called 911. Hall told CNN the ambulances arrived in 11 minutes, but he isn’t sure whether it was a call from another bystander, one of his followers or even possibly the EMS’s monitoring of social media which got the job done.

http://www.wired.com/epicenter/2009/05/twitter-trumps-911/