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cell broadcast for real emergencies

texts through registration on the site of the city hall, if cell braodcast isnt implemented by the phone company

public emergency sirens

radio

TV

actual website of the city hall

local newspaper

social fabric, with residents actually calling each others, for non emergency topics ?

(Hacker news ?)

Twitter has never been a great solution on its own. It could have contributed along with other channels of communication, so you should already have these.



Emails, too. That's how I get snow emergency alerts and bus notifications.

One disadvantage with all these is they're one-way. Twitter had reasonable ways to manage one-to-many conversations that other solutions lack.




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