"The Good, the Bad and the Ugly" is a good article by @dominikDominik Chrástecký - Blog

chrastecky.dev/technology/acti

The two mentioned examples in "The Bad" are long-time issues that were also discussed at . I just responded to one of them on the forum..

The Update(Note) quirk. socialhub.activitypub.rocks/t/

The other one is around Direct Messages which are a hack (a Note with special sauce). specifies ChatMessage object type here, which is the intended way to extend the protocol.

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