this post was submitted on 14 Jun 2023
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Fediverse
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Wait, you can force your instance to start federation with another instance!? Did I understande you correctly?
Not exactly force. It's by design. Instances don't federate with each other unless a user of one wants to communicate with the other (via subscription, or commenting, or whatever).
But instances can block each other and if that happens, there's no way you can access from your instance.
What usually happens is that big instances (like lemmy.ml), just by the mere fact that they are big, are probably already federating with your instance anyway so you may not have encountered this situation.
Oh, that's very illuminating. So how is browse.feddit.de different? Or is it different? Can there be communities on some instances that don't show up even in browse.feddit.de?
I believe browser.feddit.de is not a Lemmy instance per sé (feddit.de is a Lemmy instance) but scrapes basic data from them (communities, subscribers, posts). As I don't know anything about it's back-end I cannot tell exactly how it works.
What I know it's that there is a set of instances it knows (i don't know how it gets them, probably a list?), and those are the ones it searches for communities. You can even choose for it not to show you communities from some instances by unselecting those instances in the up-left menu.
So my guess is that if an instance is not known by browser.feddit.de their communities will not be shown there. Those are probably private instances that may not be connected to the fediverse anyway.