As with Google, Facebook was a place that just concentrated a lot of top talent. It's just sort of natural that those people would go on and continue to be successful.
There's a lot of complacency in philanthropy. People figure organizations are trying to do good, and that's enough, even if the results aren't there. But that's wasteful and inefficient. It crowds out better programs.
There are a lot of people building small ideas now. There's an idealization of being an entrepreneur, but the most important thing is to have a really great idea.
One of the purposes of life, and selfishly what makes people happy, is building things that are impactful.