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Not so sure that’s true though. If you look at a 4chan threads in some boards, you can recognize the individual anonymous’ from the ID next to them.
I suspect it’s using either a cookie, or the IP address to track a user and while not storing that info, generating an ID hash from perhaps a unique ID for the thread + their details.
No reason you couldn’t federate using the same. But, even without that, each post and comment has a post ID and replies would be tracked that way. Just, you’d need to remember which replies were your own.
The home instance could store for a thread some info about posts/comments from an IP or cookie too and highlight them. But that info wouldn’t be federated.
I actually don’t think it’d be a problem, really. But, is this something missing from our lives? I’m not so sure.
When you post in a thread you get an ID for that thread. When you post in a different thread you get a different id.
The only way i could see it working is following a particular board on an instance. So I might follow the fitness board on the chan.nz instance and id see all threads pop up and I could open them and view the comments just like on lemmy or mastodon. Actually I think that would work.
That’s what I said. You don’t need any ID to federate the messages. If you reply to a comment the nesting is based on the comment/post ID and not the usernames.
You couldn’t track a users posts after the fact, and I think that’s kinda the point.