btw, SIgnal is really a pretty good replacement for Twitter DMs
the security is not absolute, but a non-techie can look at the promises and understand what they're getting into - so it's up to journalistic use
including end-to-end secured phone/video calls
i've given it quite a workout with the El Salvador stuff
i'm in a Signal group text chat that is actually a good replacement for Twitter group text chat
here's the security promises: https://signal.org/blog/signal-private-group-system/
new members can't see old messages but that's fine y'know
also: you are your phone number, so you may need either a public phone number or a burner phone. this was a barrier to me using it for a long time (tho now i post my phone # publicly, lol). this may make signal not an option for you.
anyway Signal is great, very usable and protects non-techies in adverse circumstances. you can and should use it as just your usual chat app. I heartily recommend it to all.

Technology Preview: Signal Private Group System
Groups are inherently social, and Signal is a social app. Whether you’re planning a surprise party, discussing last night’s book club meeting, exchanging photos with your family, or organizing something important, group messaging has always been a key feature of Signal. Signal provides private gr...