On the other hand, however... If the ActivityPub API were used in an S2S context, enabling something like NodeBB to send activities on behalf of a Mastodon user, then it wouldn't matter that there is no GET /timeline, because all you need is POST /outbox and the Mastodon API handles their end.
Vice versa, NodeBB would use its own API to render a /world feed.
@julian 
@deadsuperheroSean Tilley 
@evanEvan Prodromou
Can't help but wonder about terminology use and abstractions they indicate. Nowhere in the specs is there mention of 'timeline' and neither of 'feed' (except as example use in AS).
I feel we started with powerful specs to be able to model *any* social networking use case. But where the specs had blanks gradually the impls filled these in with leaky abstractions such that fedi is now hammered into a very narrow social media microblogging domain.
If an app needs "Timeline" and "Feed" concepts, then it should model them. Given the actor-based nature of AP they might be actors, or whatever is best. These concept are about solution development, i.e. what is built on top of the protocol, and not indicative of core protocol capabilities.
There's so much confusion on "where does the protocol end vs. where does my app design start".
SDK's should offer "Addressable actors exchanging msgs with object payload", and hide all impl details for the solution developer.
If you have a fediverse account, you can quote this note from your own instance. Search https://social.coop/users/smallcircles/statuses/116099220670749584 on your instance and quote it. (Note that quoting is not supported in Mastodon.)
