Reid Hoffman

What makes the meaning of life is people, so you try to be good to people immediately around you and in your broader community. So a lot of my projects are about how I can affect the world in the hundreds of millions.

Tribalism isn't a bad thing. If you're a Facebook user, or Twitter user or Foursquare user or LinkedIn user, those are all tribes... and they may even have sub-tribes. It's not pejorative, it's declarative.