I've previously blogged about Twitter being used during an active shooter lockdown and this recent article shows that some disaster managers are seeing the overlap between social networking and information-seeking behavior in a disaster.
Emergency managers say social networking sites like Facebook, MySpace, Twitter and Flickr are changing the way disaster situations are handled.
Dr. Jeannette Sutton of CU Boulder’s Natural Hazards Center has been conducting joint research with the school’s Department of Computer Science. The center's research found that, increasingly, when disaster strikes, the Web-savvy are seeking out and sending out information via social networking sites.|Researchers: Social Networking Sites Critical In Disaster Situations - Denver News|
There's also an interesting article titled: Wind, Water, and Wi-Fi: New Trends in Community Informatics and Disaster Management |Abstract Only|by Kalpana Shankar, published in the journal Information Society (Volume 24, Issue 2, April 2008, page 116).