Communities start with who's invited (or permitted) -- with Twitter, tech movers/shakers/early adopters; Facebook, students at elite colleges; Usenet... well, s

Communities start with who's invited (or permitted) -- with Twitter, tech movers/shakers/early adopters; Facebook, students at elite colleges; Usenet... well, students and faculty at connected colleges. Once the community expands, it loses some of its initial intimacy and collective mindset. Perhaps we should invent social networks that keep people in little collectives of positive feedback, rather than subjecting ourselves to the negativity of warring fiefdoms.