Aviv, it's a great call to arms followed by a great framework for the dimensions of accountability. My first thought was that it's a little "too good": are there (large-scale) platforms/communities that succeed by your standards on any of those dimensions? I that kind of forum possible not just on Facebook but on the internet? It's tough enough in face-to-face venues. I don't want to add bloat, but in this or a companion piece it would be fantastic if you'd provide diverse cases offering examples/hopes of success for each dimension.