When I visit kbin.social, I see new posts regularly. On other servers posts stay on the frontpage for multiple days. This is also true if I switch their sorting to “hot”. So that is probably not the difference.
What is kbin.social doing differently?
@freebrick it’s using the same underlying ActivityPub protocol which is what allows for federation.
Edit: which is how Lemmy/Kbin and Mastodon can talk to each other as well.