How has the use of social media vs traditional media (TV/Radio) changed the way we interact with the public for disaster messages?

Crisis/Risk Communications has changed dramatically in the last ten years. How has the use of social media vs traditional media (TV/Radio) changed the way we interact with the public for disaster messages? How has mass notifications changed and are they only for alerts (i.e., tornado warning) or should they be used to reinforce messages such as proper use of generators?

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