Joe Fabisevich 
We really need a plethora of ActivityPub support across the internet ecosystem as soon as possible. Not everyone who’s leaving Twitter today and over the next few weeks is going to want to join Mastodon, and I think that's completely reasonable. A lot of that will leave people with no easy way to follow their favorite publications, services, and people, and I worry about the internet information ecosystem fracturing really quickly.
Now that iOS has finally added support for push notifications in PWAs organizations like the National Weather Service should seek to control their own destiny by building a simple web app which offers a timeline and a firehose of notifications about tsunamis, fires, etc, that people in danger can subscribe to without an intermediary service like Twitter.