[Smacks forehead.] That definitely explains why it looked so much like FB comments. That's a neat approach. FB moderation handles spam and blatant trolls.

Next layer moderation - promoting insightful content / burying lazy content - was more what I was thinking of originally. But that is such a tough problem here. Maybe unsolvable with comments on something so sparse as, well, literally everything online. Wikipedia has a whole (sometimes hyper vigilant) army of volunteers, and that's a tiny subset of this problem.

Hmm, yeah, I think you're probably at least at the local optimum with FB stopping spam and trolls. Good stuff.