Where does Lemmy store upvotes, downvotes, and replies?
Does ActivityPub send those to other instances, or does ActivityPub only send the original post and the rest (upvotes, downvotes, replies) are stored only on the original server where the post was made?
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They are synced. There is an insane data volume, yes. It is hell.
no way, that's a massive oof o.O
Yeah. A lot of hand-wringing has gone on about it, e.g. https://gist.github.com/jdarcy/60107fe4e653819138396257df302eef. I'll post this and then show you a video of server activity that results.
Demo post