Another issue with ActivityPub is that we have a special delivery address, `Public`, which means that the activity should be visible to _everyone_. One question that arises is, if it's visible to everyone, should it be *delivered* to "everyone"? And if so, how is "everyone" defined?
One answer to that is that the sending server should send the activity to every actor on the ActivityPub network. That's clearly too much -- literally millions of actors. There's also not a big list you can look at that shows every actor on the network. It'd also be annoying to receive every single public post in your home timeline.
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