this post was submitted on 21 Oct 2023
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But how would a user on A find anyone on B before federation? I know Lemmy can initiate federation through the search function just in case you're the first to look for something on another instance, but I don't see how that would work on Masto.
It's done through a similar mechanism, you can paste the URL of a user on a different Mastodon search which triggers the same style of search as it does on Lemmy. Mastodon has relays (an admin needs to add/subscribe to one, and the relay has to confirm/accept) however which can also help "kickstart" Federation so to speak as well - which is like blasting a firehose at an instance.
In addition, I believe that there might be a "viral" component to federation; if users on server A follow users on server B, and users on server B follow users on server C, then server C's popular posts can show up on server A's explore page. Is that correct?
If someone on server B were to boost that posts from server C, then yes they'd show up on server A as far as I know - but only if they're boosted. The federation aspect works a lot like Lemmy's, so while my instance my federates with lemmy.world (and vice versa), my instance doesn't know about the communities on LW unless someone on my instance subscribes to that community in particular (and vice-versa for a community on my instance not showing up on LW until someone over there subscribes). At least, that's how I understand it - to be honest I still don't have my head completely wrapped around Mastodon's federation aspect but since both Mastodon and Lemmy use ActivityPub I'd reckon that they're very similar.