I think that it has to do with lemmmy and instances. When no one has searched for a specific community from your home instance this community isn't known by your instance. To find niche community you must use the exact name of this community (like !asklemmy@lemmyworld for exemple) to find thoses exact names ans brosse all communities you can use lemmyverse.net
Asklemmy
A loosely moderated place to ask open-ended questions
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If your post meets the following criteria, it's welcome here!
- Open-ended question
- Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
- Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
- Not ad nauseam inducing: please make sure it is a question that would be new to most members
- An actual topic of discussion
Looking for support?
Looking for a community?
- Lemmyverse: community search
- sub.rehab: maps old subreddits to fediverse options, marks official as such
- !lemmy411@lemmy.ca: a community for finding communities
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Use lemmyverse, it's great: https://lemmyverse.net/communities?query=furry
As for the other question, no idea.
The issue with mastodon communities is that they don't use the same type of fediverse tools. You could maybe follow people from mastodon, but the apps or Lemmy/kbin will need to implement a compatibility with those fediverse websites.
To follow communities outside your instance it's a bit less optimised currently as the instances don't scrape all the communities from other servers.
So to find them, either someone else had to search it and subscribe to the community for the server to show it when you search for them, or you'll have to show the server where the community is :
For example a community from your instance : !apolloapp@reddthat.com
You can notice that I put a ! Then [community] and @[server address].
You will often see this presentation under the community name when clicking on a community : !apolloapp This is what that means.
If you were on another instance, to find the apolloapp community from reddthat.com, you'll need to search for either : !apolloapp@reddthat.com Or https://reddthat.com/c/apolloapp
I don't know if apps are able to search like this, so you may need to go on your account in a browser and search from there.
Also as stated in another comment, there are websites to search for communities, like Lemmyverse.
However you can find communities to replace the reddit ones here :
https://www.quippd.com/writing/2023/06/15/unofficial-subreddit-migration-list-lemmy-kbin-etc.html
And