Use your own experiences and pain points to identify an opportunity. Be arrogant thinking you can do it better than others.

As a child I wanted to become an architect.

I knew I wanted to do something at the nexus of what I call global development and technology.

Anybody can be ambitious.

I didn't know anything about Silicon Valley.

I think Twitter is great.

I really want to move away from the old model in which you have to rely on people giving $10 after a humanitarian crisis to a newer model where people give money but also their time and their skills, whatever they have, to the causes that are personally meaningful to them well before the crisis moment presents itself.