this post was submitted on 20 Mar 2024
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@Minotaur @henfredemars @technology You are using an account on lemm.ee to reply to someone commenting from an account on infosec.pub in a community hosted on lemmy.world.
Those are all running Lemmy software, but I am replying from an account on social.goodanser.com, which is running Mastodon software.
That's federation. We're all using different service providers, sometimes even different software, but we can talk to each other because they speak the same protocol, called ActivityPub. Threads.net has announced plans to support ActivityPub and conducted some limited trials, which they're in the process of expanding. They claim they intend to support it fully, but only for users who opt in to it.
Servers can block, or "defederate from" other servers, and many have chosen to preemptively defederate from Threads.
Wait did I miss something big? Does Lemmy now federate with Mastodon somehow? How does that work?
Always has. Anything using ActivittPub can interoperate
I was under the impression that it theoretically could but wasn’t set up in a way that made this possible. But perhaps I was mistaken.
How do I access Mastodon content using my account here then?
Threads hasn't had federation enabled until now, but you've always been able to interact with Mastodon... sort of. The Lemmy UI doesn't really have a good way of finding Mastodon posts that don't tag a Lemmy community or of following Mastodon users, but if they do tag a community the Mastodon post will show up as a Lemmy post in that community.
I see. So functionally it doesn’t really work, at least in this direction.
You've had some well-meaning but ultimately not quite accurate answers in this thread so just to clarify:
You can follow, post to and interact with Lemmy communities from Mastodon, because they're treated the same way as a "group" on Mastodon in general.
You can NOT follow and interact with Mastodon users from Lemmy, because Mastodon accounts are individual "users" and Lemmy doesn't have the concept of following and interacting with users, only with communities. If Lemmy ever does add a feature to let us follow other users, then in theory following Mastodon users will also become possible.
You can't use mastodon from Lemmy, but you can from some threadiverse software like Kbin.