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Your Home Feed is the inbox of an ActivityPub actor — in particular YOUR ActivityPub actor.
There could be an actor for each hash-tag, too.
You could even do Del.icio.us like things — and have actors for intersections of hash-tags, too.
These hash-tag actors' inboxes would need to be readable by anyone.
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This could be a more ActivityPub like API alternative to Mastodon's "GET /API/v1/tags/{name}" API.
#ActivityPub #FediDev #FediDevs #Fediverse #HashTag #HashTags
Yes, that seems like a good analogy.
Ideally —
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For the former —
From a UX point of view, they (Bob's followers who don't yet follow Alice) could see a placeholder post for Alice's post(s), that says that the content cannot be shown.
If a follower of Bob's then followed Alice, then the placeholder post(s) would turn into the actual post(s).
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For the latter —
Again, from a UX point of view — Placeholder posts, until they follow Alice or Bob.
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By default, visible to both Alice's and Bob's followers.
But, Bob should be able to change it. Even making visible to everyone.
