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There's an open feature request for this: https://github.com/LemmyNet/lemmy/issues/818

Others have answered your main question but just so you know, the word you're looking for there is "community" :)

No, not possible at this time. It is a requested feature, so maybe eventually.

don’t think that’s possible atm but I’d love to see that functionality get added as well

u can use an rss reader and put their rss links in one folder, now u can read them together.

Hi JB, I went down this rabbit hole last week, here is a post I made summarizing what I found, with links to the dev's GH discussions of the different ideas for implementing the linking of communities, both within an instance or across instances, public or private, mod or user created. These features would likely be implemented separately.

There is also a link to a firefox extension that you may find useful while the dev work is ongoing.

See https://lemmy.ml/post/1615183

!slide@feddit.uk has subreddits as a feature built in and, while it is still early days, there's no reason it couldn't work here (Calckey has antennas which is, probably, fancier).

Hi. You've posted the same question in a couple different places. You might consider waiting for an answer before doing that. Thank you!