Quote posts in Threads now include a link to the ActivityPub data of the quoted posts. This makes it possible for Fediverse services like Firefish and Misskey to fetch the quoted post and show it inline in the quote post. I updated the blog post with some information on this https://seb.jambor.dev/posts/understanding-activitypub-part-4-threads/
Thanks @pcottle for the heads-up, and for some information about design choices that went into this.
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