@steve @mariusor @nick Most deletes happen soon after posting, before many non-followers have fetched the object. Most posts are never boosted anyway. So maybe: if a post has never received an Announce, send the Delete only to followers; once it has, fall back to the current wider delivery.
The obvious race is a boost arriving just before the delete, but I think that still mostly works. The server receiving the Announce has to fetch the original, and by then it should get a 404 Not Found.
That would avoid a lot of unnecessary Delete fanout.
