Very good article. Personally, openness is the way to go.
It resonated with me less so because of a stance on open vs closed than because I share similar sentiments regarding the specific communities Josh cited. Amazing communities to be sure but clearly with insider social norms/status and unwritten rules. The same can be said for Twitter, of course, but I think there's a lower barrier to entry. (Disclaimer: I haven't read Fred's or Anil's posts yet)