>I've always wished there was a social network that applied some sort of "I am interested in [person] by [amount]%" premise, but recursively.

That's how they all worked in principle.

The "problem" for FB, Twitter, YouTube (and others) is that some people trust Alex Jones and since the 2016 election we've been in a moral panic around misinformation (Russian or otherwise). Our big idea right now is making sure that tech conglomerates choose for us the people we should trust.