The pace at eBay was frantic and urgent. We knew that if we didn't move fast, somebody would come into the market and quash us. Participant doesn't make a lot of sense from a financial investment perspective, so it's unlikely that other people will be approaching the business in the same way. So you see less urgency; you see a thoroughness and willingness to spend extra time to get things right. Which I think is really important.

Not everyone can be Gandhi, but each of us has the power to make sure our own lives count - and it's those millions of lives that will ultimately build a better world.

Social entrepreneurs come from all levels of society and from communities in nearly every country of the world. They all share the same underlying drive and passion to see their ideas through. Many of them have had a huge effect on the world, yet most people have not even heard of them - a trend we hope to change!

Business skills, when well applied, can do more than just make money. They can potentially make money and do some real good, which is immensely satisfying. To do that, it's important to think outside the box, take risks, and be an entrepreneur.

A little bit of good can turn into a whole lot of good when fueled by the commitment of a social entrepreneur.

I was living in a house with five guys, eating their leftovers when they weren't watching. I went from that to having $1-billion-plus on paper.

I believe that Silicon Valley is truly a place of excellence and the impact of this tiny community on the world is completely disproportionate to its size. We are the undisputed leaders of technological change. But with our abundance of talent and resources, we also have the opportunity to be the pioneers of social change and, ultimately, this may be our greatest contribution.