A lemmy post, being a link aggregator, has other fields that twitter-type services don't have in their simple notes. IE, a post title, link, body, etc.
Issue for this: https://github.com/LemmyNet/lemmy/issues/2590
this post was submitted on 20 Dec 2022
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I see! Thanks
The "external account"'s platform would need to have activitypub group support. I admit I've not played around with this enough, but it's to me understanding that if your platform supports posting to ActivityPub groups, then they can post to Lemmy communities.
ActivityPub is pretty broad so "group support" isn't really sufficient, in the same way that Note support doesn't automatically make your implementation compatible with miskey, pleroma, or mastodon. Two different implementations could send messages of different types or address them in different ways.
I see that I can reply to a post in Lemmy from Mastodon by using the @user@lemmy.ml notation. If I wan to post on say [!seresearch@lemmy.ml](/c/seresearch@lemmy.ml) from Mastodon, what incantation should I use?
I'd be interested in knowing this too. I'm in the process of building AP support into my website and I'd like to be able to post to Lemmy communities from my site.
I know "group support" is required, but I specifically would need to know stuff about addressing and the message format. Are Lemmy posts Link objects? Do I put the community's id in the to field or audience.
On Friendica, all you need is to !-mention the community where you want your post to appear
I see. Good to know.