I was interested in this too - however identities are infinite and so are then followers and following relationships. You need another quality metric, the following link is not enough.

I also read a couple studies about this and how their attempts to use Pagerank for human relationships yielded poor results. I’ve lost the links to them, but doesn’t mean it can’t work.

I dislike approaches that marginalise new or less connected accounts - they create a barrier to entry, echo chambers, and it’s not directly correlated with actual content value.

I think we’ll end up with a bunch of signals, where each signal not enough on its own. Pagerank, PoW, spam score, relationship distance, past interactions, verification, etc.