(streams) recognises them as group actors in its directory AFAIR. So there has to be some truth in that.

@silverpill I've yet to see Hubzilla backfill an entire existing thread at once. It does backfill posts from new connections on certain server apps, though. And it sometimes appears to backfill threads bit by bit over prolonged periods.

As for (streams), I can't see inhowfar it backfills because I barely actually follow anyone from there.