Have you guys considered this as part of your initial sign up journey?
The product is slick and super simple and everything seems to be working ace. But, I just realised that I missed the 'Rules' list. Perhaps Sam talked through it during the video, but I watch the video and signed up at a much later time, so I think I forgot about it. As a result I just realised that I've made a couple of posts without searching for that content first.
Perhaps... if the 'Rules' where shouted out during onboarding... I would have known to search before creating a post. Maybe they were, I can't recall. But, either way onboarding can be a useful tool if implemented well. Just a thought.