Online Disaster Communities...What/where are they?

A number of disaster related online communities and portals related have popped up in recent years.  I am researching and compiling a list of all social network, portals, blog, and news resources related to disaster management, business continuity, and homeland security.  I hope to publish this online in the next month for free. Please comment on your favorite online community.  Please include the target audience as I will be organizing the list by end users.

For example, here is a short list of communities that I have already identified:

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