I've proposed this before: http://news.ycombinator.com/item?id=391292 http://news.ycombinator.com/item?id=391292 The big question would be how to propagate sub

I've proposed this before: http://news.ycombinator.com/item?id=391292 http://news.ycombinator.com/item?id=391292 The big question would be how to propagate submissions and comments between communities. Especially if each community develops its own unique character. I've thought about organizing each community onto branches of a B-tree and letting upvoted submissions move up the tree, though my intuition says that this might not scale, as one community might overpower the rest. Anyway it would be interesting if someone builds it.