I'm just going to point out that Mozilla and the NSF recently offered $2M for ideas to decentralize the web.
https://blog.mozilla.org/blog/2017/06/21/2-million-prize-dec...
https://blog.mozilla.org/blog/2017/06/21/2-million-prize-dec...
I imagine people could delegate moderation responsibility to people and organizations with a strong reputation. Let's say GNU, EFF, and Larry Lessig would all publish moderation data and metadata; as well as your "friends" on various social media sites, friends-of-friends, etc.