Well, certainly in the emergency info sense
US to use Facebook, Twitter to issue terror alerts
WASHINGTON – The U.S. government's new system to replace the five color-coded terror alerts will have two levels of warnings — elevated and imminent — that will be relayed to the public only under certain circumstances for limited periods of time, sometimes using Facebook and Twitter, according to a draft Homeland Security Department plan obtained by The Associated Press.
Some terror warnings could be withheld from the public entirely if announcing a threat would risk exposing an intelligence operation or an ongoing investigation, according to the government's confidential plan.
Like a gallon of milk, the new terror warnings will each come with a stamped expiration date.
Read more at news.yahoo.com
The 19-page document, marked "for official use only" and dated April 1, describes the step-by-step process that would occur behind the scenes when the government believes terrorists might be threatening Americans. It describes the sequence of notifying members of Congress, then counterterrorism officials in states and cities and then governors and mayors and, ultimately, the public. It specifies even details about how many minutes U.S. officials can wait before organizing urgent conference calls among themselves to discuss pending threats. It places the Homeland Security secretary, currently Janet Napolitano, in charge of the so-called National Terrorism Advisory System.