Whenever I see a small company having a startling large impact on the world, I look for an engine. I look for something that is amplifying what a relatively small number of people are doing. For example, the engine that rocketed Facebook (and Wechat) upwards was the economics and psychology of social media (plus viral marketing). The engine that powered Macau to become five times Las Vegas in a few years was the psychology of gambling plus 1.4B Chinese consumers. And so on.