You can do it in the threadiverse but that would be on PieFed not Lemmy.
this post was submitted on 11 Mar 2025
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As far as I know, it is possible on piefed since a recent update - you may want to check it out!
https://join.piefed.social/try/
If you want to get a gist of what it looks like, https://lemmy.world/u/mesamunefire maintains one for PeerTube and other Fediverse videos:
Yep! It works really well!
Plus the feeds can be used for threads not necessarily just on Lemmy/piefed/etc... but also mastodon/peertube,/pixelfed etc. Works closer to a big RSS except any interaction like upvotes/downvotes, comments and others. It's very well thought out.
It isn’t with lemmy. The two main solutions is either to use Piefed. Which is a desktop only software that federates with lemmy and has this feature.
Or if on mobile, have a couple different accounts of different instances and use each as a “multireddit”.
Eternity has this too. Multicomunity in the side panel.
It's bugged atm.
Piefed has this feature recently, lemmy doesn’t yet.
And it’s interoperable with Lemmy for those unfamiliar. So you’ll be able to see and interact with the same content you can on Lemmy.
Relevant discussion: https://github.com/LemmyNet/lemmy/issues/818
That pull request was opened five years ago. Meanwhile, PieFed has this feature in production already.
Piefed has an awesome dev. And the tech stack is very easy to read (in my opinion).
Ouch
The app Arctic for Lemmy lets you combine multiple communities into one feed.
Probably not a great workaround, but you could subscribe to the communities rss feeds and group them in a feed reader
That would be great. I would love multiple custom feeds.
This would be good for instances if a default custom collection could be added to the "subscribed, local, all" selection.
Then an instance could show the content it wants to represent.
Instance can hide some communities from their All feeds: https://lemmy.zip/post/33065677
A bit if a workaround, but can potentially achieve that
One of the mobile apps has this feature, might be summit or connect. but otherwise no.