"Everything we look at now in the social world that is large and good started out as small and good, and had people working on making it bigger, rather than starting out large and mediocre and having people work on making it better."

- Clay Shirky, 25:25

Full video is an hour but if you start at the moment above you can hear some real insight into what does (and does not) build good communities on the web.

Shirky is brilliant. Very insightful.