Interesting, I thought every social network that implemented the ActivityPub spec behaved in exactly the same way. Thanks!

This means that if user 1 from server A requests a post from server B, server A will cache that post. Then, if User 2 from Server A wants to see the same post they get the cached version instead of the remote instance pushing it to server A? Is this cache eternal (i.e it is never deleted from Server A) or is that something the spec doesn’t address and it is up to each server owner?