New blog post: Understanding ActivityPub - Part 4: Threads
A first detailed look into how Threads implements ActivityPub. Learn about the data that is shared (or not), an interesting implementation of HTTP signatures, and Threads' take on quote posts in ActivityPub.
@crepels Nice article! In particular, this is the best explanation I've seen yet of the "infinite signature recursion" problem, and the way around it.
I haven't tried to talk to Threads from my own toy implementation yet. I have a suspicion that the "instance actor" requirement is going to give me a headache.
