Here is a video of a TED speech. It somewhat explains group colaboration for ideas in peoples spare time. When I listened to it I thought of HBT. We all share ideas to help progress our knowledge and others at the same time. Very interesting speech.
http://www.ted.com/talks/lang/eng/clay_shirky_how_cognitive_surplus_will_change_the_world.html
http://www.ted.com/talks/lang/eng/clay_shirky_how_cognitive_surplus_will_change_the_world.html