For your first question, I found this: https://lemmy.readme.io/reference/getfederatedinstances
this post was submitted on 03 Nov 2023
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This is super useful! Thank you!
The simple answer would be just to click "instances" at the bottom of any lemmy page to view the list of other instances the one you're on is federated with. Most instances have both a linked list and blocked list on that page.
This is good, thank you! How about Pixelfed, Pleroma, Misskey, kbin?
Would be better to ask users on those sites directly, since we're only familiar with Lemmy here lol