I've sketched a few ideas for what you'd need to make Usenet, ah, usable given modern concerns (primarily spam and spoofing). The biggest takeaway in my explorations is: you could probably never really get mass adoption of a Usenet-esque system these days. Oh well. Anyway: I'd start with the basic idea that identities matter. For any given message, you should know what user posted it and from which server. It doesn't…
At first blush the curation signer looks the same as the server, but I think its subtly different in a way that is maybe effective?
A) You can re-curate or multi-curate a message, but you should (probably) keep the source community constant
B) It separates moderation concerns from on-topic concerns which is a constant struggle. Easy for a server to host many different communities/topics/communication mores and import the content stream in different ways from different curators
Who does the curation? I guess its as simple as the upvote button, but perhaps you can improve that model substantially