By building a simple system, with just a few guiding principles, eBay was open to organic growth.

I started eBay as an experiment, as a side hobby basically, while I had my day job.

In 1991, I co-founded my first start-up, Ink Development, which made software for an early tablet computer.

Build a platform - prepare for the unexpected...you' ll know you're successful when the platform you've built serves you in unexpected ways.

Whatever future you're building, don't try to program everything.

What we say here every day is that our success is really based on our members' success, our community's success. We've created an infrastructure and laid some basic ground rules to create this marketplace.

In the same way that you're driven in your business to keep innovating - Facebook is a wonderful example of constant innovation - think about doing that in philanthropy.