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Firefish Could Be the Next Big Thing
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
I've been happy with Tusky https://tusky.app/
I'm using tusky already. it's alright, but it doesn't even have an explore tab.
I also use Tusky, but only for simple purposes, to have a quick look at my Mastodon and Friendica accounts. Fedilab (which also supports Firefish, but only basic functions) can do a bit more. For Mastodon, Moshidon and Megadolon are often recommended.