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Wouldn't SMS fit the bill? Everyone has it and it's quick to send out if you have the system set up for it.

• tapland 7y ago
  Yes, as a system for publishing. But it's only a way to transfer the notification, not a source.
• mehrdadn 7y ago
  SMS isn't a notification source, it's a communication medium.
  • capableweb 7y ago
    > HTTP isn't a notification source, it's a communication medium. > WebSockets isn't a notification source, it's a communication medium. > Email isn't a notification source, it's a communication medium. Seems like sometimes communication mediums are being used as notification sources. And that's fine.
    • mehrdadn 7y ago
      Do you feel you may have completely missed the point of the question?
      • Kudos 7y ago
        I feel you are being obtuse and pedantic and not actually helping people to help you.
  • tyfon 7y ago
    It's used for urgent notification of the public by the Norwegian government and municipalities. It's also very easy to accurately target specific areas as all the numbers are registered with the address of the owner. The benefit is that you don't need any infrastructure except for the phone network so there are very few servers that can go down etc. Edit: I see my error!, Yes it's not a source. Never mind my comments :)