If you instead mean regulation of what information enters a consensus... That's basically every history book. Every encyclopedia. The curated speaker list at a convention. The moderated comment stream on Hacker News.
And yes, such regulation can be used for ill also. The fascists in World War II used direct control of broadcast media to shape the thinking of the population. Of course, so did Roosevelt with his fireside chats.
I don't know what the future of information exchange in social media looks like. But I'm getting a strong sense that it doesn't look like Facebook and Twitter. I don't think those systems provide the right tools to build consensus.. instead, they seem to build cacophony. They reward enragement (because it drives engagement) and make it difficult for people unfamiliar with the topic to distinguish mainstream opinion from fringe.
My observations suggest that human beings above 18 are adults and can think for themselves.
"Benevolent" attempts at manipulating the crowds by people who think they are wiser or more knowledgeable...leads to more harm than good.