Do you think humans evolve socially?

For the purposes of this question the term ‘evolve’ refers strictly to the biological process of evolution and not a synonym for progress or develop. Though if you don’t believe in evolution yourself you’re still welcome to contribute your perspective.

Human societies have demonstrated significant change over the centuries, from rudimentary tribal systems, to socialist hubs, to industrialized giants; humans evidently alter their society over time. What I ponder is whether or not you, my kindly Fluther folk, consider these alterations to be simply a product of convenience (perhaps even coincidence?), or illustrative of a more fundamental change in human nature brought about by our social dynamics. More importantly, what do you think this could mean for the future of our species from a social standpoint?

As always I look forward to your thoughts :)