At least one missing element is that of reputation . I don't think it should work exactly like it does in the real world, but the absence of it seems to always lead to major problems. The cost of being a jerk online is too low - it's almost entirely free of any consequences. Put another way, not everyone deserves a megaphone. Not everyone deserves to chime in on any conversation they want. The promise of online discu…
I like your comment about "track record of insightful, levelheaded conversation", but that introduces another abstraction. Who measures insight or levelheadedness, and how to avoid that being gamed?
I general I agree that reputation is an interesting and potentially important signal, I'm just not sure I've ever seen an implementation that doesn't cause a lot of the problems it's trying to solve. Any good examples?