There are instance-independent links to communities, for example: FindAKbin@kbin.social.
The good thing about it is, it will keep you on your home instance logged in while visiting the target.
How to make a similar thing to link to specific posts, or specific comments?
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You can’t really do that with specific posts or comments, as far as I can tell. The IDs from one instance to another don’t line up. I actually didn’t realize that until right now. I could see that making linking to a comment annoying, especially if you then wanted to reply. There are clearly some details to iron out with Lemmy and Kbin.
The IDs from one instance to another don’t line up.
Yes. I guess it would make sense to link to the original instance, which hosts the community in which post/comment live.
I tried combining the link to your comment (as seen from the hosting instance) with the instance-independent link to the community, but it does not work.