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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How to use discussion groups on Mastodon and the Fediverse | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse

An unofficial guide to using Mastodon and the Fediverse

Groups federate much more effectively than hashtags, so they are a useful alternative to hashtag following. Group posts reach all the group's followers no matter which server they are on. This makes them very useful on very new servers that haven't built up many connections yet.

I haven't listed any example groups by @-ing as I don't want to spam any group's members. However, if you want to post to a group all you need to do is @ it.

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@feditips

If this kind of #groups functionality is provided as third party services, we have to understand them better before trusting them.

What are the terms of those services, what are resources and economic models powering them?

We have to know that by engaging we have our data safe and that we can rely on the service to sustain groups for our community in the long term.

@dudenas

The Groups functionality is provided by servers running on FOSS, so its complete workings are available for outside inspection, and anyone with the needed technical knowledge can set up their own Groups server using the same software.

The people creating Guppe and running the main server are exceptionally transparent with their funding, they have a funding and budget page for their co-operative at https://opencollective.com/guppe-groups

And as Wakest says, it doesn't host data, just passes it on.

Guppe Groups Platform Co-op - Open Collective

The social groups app for Mastodon and the Fediverse where supporters decide what features to develop - brought to you by Immers Space

@dudenas

"If the relay service suddenly becomes unavailable, communities may crumble"

That is the nature of the internet, if you rely on someone else's server.

That's why the Fediverse exists, to allow anyone to run their own servers, and avoid too much reliance on one server.

It is also why the Guppe software is FOSS so that anyone can set up their own server instead of relying on Guppe's official one. Guppe is providing all the right options, it's up to others to use those options.