You can express your generosity in ways that are virtually limitless. This was what I wanted to convey in 'Giving 2.0' - that whether you have $10 or $10 million to give, if you identify the right opportunities and make the most of your resources, your impact can be tremendous.

Philanthropy is often seen as society's risk capital. That means the onus is on philanthropists, nonprofit leaders and social entrepreneurs to innovate. But philanthropic innovation is not just about creating something new. It also means applying new thinking to old problems, processes and systems.

How I see my career is very much as an entrepreneur in the field of philanthropy.

Online, you can become much more than a reactive donor - you can become a proactive, strategic, collaborative philanthropist, improving your giving every day by tapping into the wealth of philanthropic resources available at the tap of a keyboard or the click of a mouse.

Tobey Maguire and I had a tough relationship - it was a tough working relationship. We butted heads, and ultimately, I lost the Los Angeles game because of differences with him. But then I moved to New York and built a bigger game, five times bigger, making more money, and that was pretty exciting.

I don't play for the money.

I can't think of anything I would rather do with my money than buy my children the best possible education.

People don't like it, but inevitably we need to think about both the costs and the benefits of health care. We cannot avoid the financial consequences.