@samsethi so, I think you should just publish the activities that make sense for the problem domain, and we can worry about getting support for them by other platforms afterwards.

@samsethi here are the Object-Types that are supported by Mastodon and that will be transformed into a `Note` https://github.com/mastodon/mastodon/blob/ca8e892c1abb91722c256030c83cabec8e3445ff/app/lib/activitypub/activity.rb#L9

@evan sadly its chicken and egg. If we publish with the listen verb and no apps read/render it then. our users will ask why their activity was not published. So we are forced to use the lowest common denominator aka note so it is read now by AP clients. Very happy to experiment as I know we are a new use case.

@samsethi @evan this is why AP servers need to advertise what activities and objects they support, without this we'll almost never be able to use the full vocabulary, as everyone will choose the lowest common denominator for the platform with the most users.

@julian @renchap @pfefferle @mike @michael @hongminhee

Same for #CastoPod: Mastodon was/is the reason they actually send the creation of a `Ǹote`, which essentially contains the name, summary and the link of their well defined PodcastEpisode ActivityStreams object. In fact adding a new supported object type to Mastodon is a one-liner and I was a bit sad that not even a issue got opened. But I hope we can overcome such hurdles in the near future!

@thisismissem @evan 100% agree but how?

@samsethi @evan I think this links to the various efforts: https://github.com/w3c/activitypub/issues/430

@thisismissem @julian @pfefferle @manton @samsethi @renchap @andypiper I don't think "capability negotiation by nodeinfo software version" is a good idea or at all desirable.

@thisismissem @pfefferle @hongminhee @julian @renchap @mike @michael hot take, but mastodon should be able to convert *anything* into a status "simply" by taking name/summary/content if present. https://www.w3.org/TR/activitystreams-core/#h-text-representations

@trwnh @julian @pfefferle @manton @samsethi @renchap @andypiper

It's a stop gap solution until we have something better.

@trwnh @thisismissem @pfefferle @hongminhee @julian @renchap @mike @michael but one thing I'd note: I think objects should always degrade gracefully into something note like, but that's not the case for activities

Imagine I used a federated last.fm like application. If Mastodon converted as:Listen to a note, my followers would probably get pissed off about the "Now listening to: X" statuses every 2 minutes

@trwnh @hongminhee @julian @michael @mike @pfefferle @renchap @thisismissem back in pump.io these things were relegated to your "minor feed". Absent an equivalent, I think implementations *should* suppress them. If your use case isn't amenable to this behaviour, you should probably consider if an activity is appropriate for it

@erincandescent @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap

i think this is on the user/client to not publish/deliver every single scrobble to all followers. mastodon should still be able to render arbitrary activities if there is a text repr of them.

@trwnh @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap I think publishing every scrobble to my followers is how I expect federated last.fm to work. It's on recipients to hide these things

@erincandescent @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap

a combination of `streams` and followable Collection-actors is how i’d approach this. we don’t need to be stuck in a paradigm of sticking every activity into one outbox, nor should every activity always be sent out to all followers.

@trwnh @hongminhee @julian @michael @mike @pfefferle @renchap @thisismissem I think the activity Vs object distinction is very important because it models a semantic thing that by default objects are important but most activities are not

@erincandescent @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap

this is like saying “i’m going to email every scrobble to my entire contact address-book and it’s their job to filter out such emails”

If I remember correctly, Mastodon simply implemented a link to the source as the ‘solution’ for as:Article. This is not what users expect, it is not what the author had in mind, but it is probably considered ‘sufficient’ by Mastodon.

Mastodon shouldn't ‘adapt’ to other services either, but it should implement the AP standard properly. The way it has been handled so far, it feels rather arrogant.

@erincandescent @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap

i don’t find this to be the case. in this case the “post” is not the Audio object, it’s that you Listened to it. it’s actually far more common for the activity to be more important than the object.

@trwnh @julian @mike @hongminhee @thisismissem @pfefferle @michael @renchap we don't really have a way of knowing what activities our followers are interested. In fact in the general case that's impossible; if I started using a music suggestion system based upon my friends listening habits today, I'd like to be able to use their historic listening data that they have been broadcasting to seed it.

Alternatively, consider that I decide to make my listening history public and it hits a relay. My as:Listen activities are going to absolutely carpet bomb the federated timeline.

Aside from the Annointed Two (Create, Announce) we really need to treat most activities as ephemeral and largely unimportant