I've written software used by thousands of companies for a couple decades. That makes me happy just as much as the salary I made writing it. Providing utility t

I've written software used by thousands of companies for a couple decades. That makes me happy just as much as the salary I made writing it. Providing utility to large numbers of people is satisfying. And for your startup to change the world...well, a billion users certainly puts you further down that road, doesn't it? Why can your startup change the world outside Facebook but not inside Facebook?