Let's put aside originality for now. I think with a few small deep structural changes, you can get 80% of the way there. I would have all posts require a tagg

Let's put aside originality for now. I think with a few small deep structural changes, you can get 80% of the way there. I would have all posts require a tagged context, let's call it a topic (in reality it'd be multi facet hierarchical object). I would also have all profiles list the topics they'd like to be credible in. The credibility score for a given topic would be an algorithm that would use followers credibility scores to "rub off" on your score for that topic. You seed the profiles you know to be credible and then propagate the graph. It'd initially be a guesstimate and then gets refined as more humans rate, interact and judge the post. Over a few posts, I think you'd be able to get a broad credibility bucket for a given profile/topic pair. Btw I've built a social network with tens of millions of users and we used this approach and it works pretty well. It does require a bit of moderation and bad actor weeding out but for the most part it works. Also, FB and Twitter aren't full of retards (shockingly) They know they can do this but they also know they would tank a shitload of their core quantitative metric for a vague qualitative metric. It'd just never happen from within.