Stone Age brains and the social web

I just listened to a brilliant "All In The Mind" podcast on "Stone Age brains in 21st century skulls" while jogging around Highgate Woods:

Front up to your shrink, and you bring a menagerie of hunter gatherers, anteaters and reptiles from your ancestral past with you. Or so Professor Daniel Wilson and Dr Gary Galambos believe. Both clinical psychiatrists, they provocatively challenge their profession to look to the Darwinian roots of human neuroses, and the evolutionary battleground that is our stone-age brain.

The podcast confirmed my thoughts on the importance of intimate social context in our lives—specifically, social intimacy appears to limit the extent to which the dynamics between manic/dominant and depressive/submissive personalities become excessively polarised within groups.

Such polarisation of social dynamics is an adaptive behaviour that is deeply rooted in the reptilian brain: assertion of leadership by the few within a small community allows the community to function without constant fighting. 

However, the exploded social contexts we live within in the modern world can distort assertion and submission into manic/psychotic and depressive behaviours respectively. Fascinatingly, we're told that all four of the major leaders in WWII (Churchill, Hitler, Roosevelt and Tojo) had manic personality disorders of one kind or another.

Given all the above, how might we build social software that helps us rediscover intimacy of social context in an exploded society? Sounds like it's a fairly urgent mission.