Twitter was started by an already successful founder (Biz Stone); Facebook was a profitable company that did sell itself (through further investment) to re-posi

Twitter was started by an already successful founder (Biz Stone); Facebook was a profitable company that did sell itself (through further investment) to re-position as a world-changing company. As an entrepreneur you are in the best position to change the world after building a profitable, sustainable business (vs initially aiming to change the world). You can do it over and over with the same venture (like Jobs, Zuck, Wolfram, etc) or you can build, sell and then repeat (Andreeson, Thiel, etc). Either way, changing he world is about iteration, persistence and taking advantage of the world changing opportunity when the time is right. Of course you can get very lucky, but statistically, as an entrepreneur the best way to change the world is to build a profitable company and then repeat.