This is a question I have been wondering about. Has any of the people in the disaster areas used FB to get info out? When those tornadoes hit last year, that is how we got news about ice, gas, etc. a local radio station went storm coverage to get the same info out. We did not have power but some off our phones worked and most people had battery radios.
Shortwave radio is the way to get info out in disasters, but that is old and passe now in the world of facebook.
When Ike was blowing through galveston I was listening to guys on the island with a battery and a longwire.
The next AM they (the people on the scene) coordinated the first responders.