Lemmy.world is now the biggest Lemmy instance!
https://lemmy.fediverse.observer/list
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As far as I can tell from here, kbin.social has about as much people on it.
Can I join kbin.social with Lemmy clients or do I need a separate app?
Might have to test that one out yourself. Ofcourse you can subscribe to kbin.social communities from your lemmy.world instance but if you can actually add them that's another question. Let me know :P
Adding doesn't work, at least not in jerboa.
In case you didnt find an answer already: Yes. https://lemmy.world/post/335116