One other thought: disruption does not equal social impact.
If I hear one more argument about how Uber (to pick an easy target) is an impact company because it has disrupted the traditional livery business… argh. Simple comparison: Uber vs. Juno. The former is a wealth-concentration mechanism masquerading as a workforce liberation machine. The latter is a distributed wealth creation mechanism. There is much to be learned from the comparison as we move relentlessly towards a more equitable/responsible/enlightened/sustainable form of capitalism.