What role does Social Media play (or should play) in Homeland Security and Emergency Preparedness

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What role does Social Media play (or should play) in Homeland Security and Emergency Preparedness [Be sure to consider all four phases of emergency management when answering this as well.]
SOURCES INCLUDED MUST BE: 
http://www.inderscienceonline.com.proxy.library.vcu.edu/doi/abs/10.1504/IJEM.2015.071045
http://web.b.ebscohost.com.proxy.library.vcu.edu/ehost/detail/detail?sid=5b0fc1d7-6651-4d57-baf1-97af28d5bf37%40sessionmgr112&crlhashurl=login.aspx%253fdirect%253dtrue%2526scope%253dsite%2526db%253da9h%2526AN%253d97178212%2526msid%253d604024295&hid=107&vid=0&bdata=JkF1dGhUeXBlPWlwLHVybCxjb29raWUsdWlkJnNpdGU9ZWhvc3QtbGl2ZSZzY29wZT1zaXRl#db=a9h&AN=97178212
http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1146&context=jss
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