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Pixelfed Groups Are Coming to the Fediverse "Very Soon"
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
If you're interested in Facebook style groups, I recommend Mobilizon from Framasoft
I was under the impression that Mobilizon was primarily just for events? That was their original premise when they launched a few years ago.
If you look at it they have "posts" and announcements as well as an area to submit group resources