nostr definitely supports those uses cases though, so you could build a nostr facebook if you wanted to.
I've been using it as a notepad ...
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And a chatroom... lots of flexible and interoperable use cases
Other than the notepad, these examples make sense to me.
Notepad entries are just text notes. Threads are notepads. You can have a notepad with a tree-like structure. I was testing this because I was experimenting with an "edit" note for updating existing notes.