A number of governments (France, Germany, Switzerland, Netherlands), international organisations (The European Union, The Council of Europe, W3C etc), public broadcasters (ZDF, the BBC, PBS/NPR affiliates etc) have set up servers or accounts on the Fediverse.
Please ask public services in your country/region/area to follow their lead. I can do a shoutout on @FediFollows to help get them started.
Musk's Twitter hides all its accounts behind a sign-in page, so it's no longer a public channel.
it's gotta be said -- Mastodon's search function is weak
do you have actual accounts you could list, especially for those broadcasters?
Yes, I've been posting them on this account in last few days. If you browse my account at @FediFollows (or at https://fedi.directory) you can see lots of examples of such accounts.
"Mastodon's search function is weak "
If you opt into full text search, people will be able to search your posts by entire post instead of just hashtag:
https://fedi.tips/how-do-i-opt-into-or-out-of-full-text-search-on-mastodon/
I'm assuming public bodies would definitely opt into this, because all their info is intended for the public.