There are lots of interesting group accounts you can follow on here, they work like this:

1. Follow a group's account to see discussion of its topic
2. @ the account if you want to post to the group
3. The account boosts anything @-ed to it, be careful when you @ them so that you don't spam the group (spammers tend to be reported and blocked)

More info, incl. how to create groups, at:

➡️ https://fedi.tips/how-to-use-groups-on-the-fediverse/

I've listed some active and friendly groups at:

➡️ https://fedi.directory/tag/fediverse-groups/

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