If you allow logged-in users to down-rank a site, you already did the hardest part, which is to differentiate bots and spammers from real users. From there, yo

If you allow logged-in users to down-rank a site, you already did the hardest part, which is to differentiate bots and spammers from real users. From there, you can easily add positive feedback as well, IMO. But the first part is really hard. Maybe it needs to piggyback on some centralized government emitted number, which is sad, but maybe the only solution. I'd love some biometric hash, or similar, but those decentralized IDs have been a promisse for years and have yet to catch on, for whatever reason.