If you like Facebook Groups, #Calckey has something similar. They are called "Channels".
Currently, they are localized to each Calckey server, but there are plans to federate them across the Fediverse.
Posts to channels (but not channels themselves) can be broadcast across the Fediverse.
This is one big difference between Calckey and Mastodon.
Here's a "Music Recommendations" channel on https://calckey.social.
I've been a part of many social media efforts. For example, I helped build and grow Hootsuite.
But nothing compares to what's happening with https://calckey.social (and #Calckey) right now.
Right now, the growth is entirely word of mouth.
No advertising, press releases, Silicon Valley-style hype.
But last November, I told @kainoa that this could be a project that changes their life.
I'm honoured to help in whatever way that I can!
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