this post was submitted on 22 Jun 2023
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Lemmy
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Thanks to Marius, looks like when you interact with a server you get assigned a local id that's tied to your username/email combo. So no global ID but all your actions on a server are tied to you. It wouldn't take a lot to link that to your account on your home server.
Overall idk if it's a big deal. Upvotes and such need to have a user ID tied to them in order to keep things straight. Unless someone wants to update the Lemmy software to start encrypting the GUID on the table an instance owner will always be able to see what you've voted on ON THEIR instance. Reddit totally can as well, but they had a reason not to put their users on blast (At least until lately lol).
It'd take some collusion to put that all together across the fediverse.