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Here's what I've gleamed. Say you make a magazine for toys. It is now addressed as [email protected], you associate the word toys as the badge for it. You'll see things posted in microthreads that have that badge under that magazine. However that magazine is separate. Every so often Lemmy will download changes from federated servers like kbin. It will then add your [email protected] and users will see it when they search for toy based Lemmy channels (not sure what it's called). But from that point on, Lemmy will refresh with changes you've made and it'll show up over there. Thats how you browse Lemmy stuff here.

It depends slightly where it is posted, and whether somebody has previously shown interest.

Kbin will see as much of a Lemmy instance as any other Lemmy instance... But a Lemmy post is only mirrored on a kbin instance (or another Lemmy instance) once somebody (anybody) on that instance has subscribed to the community it was posted in.

For the most part that means yes stuff magically just shows up, but if you are seeking something more niche or specialist you might need to seek it out more directly.

Same is true in the other direction, stuff posted in any of the large magazines here on kbin is going to be mirrored to most Lemmy instances, but smaller or new magazines might not see it unless or until somebody there proactively seeks it.