There are lots of cycles to markets - boom and bust - and also in perceptions of people. The conventional wisdom of Steve Case as genius or fool was highly cyclical. The truth was always in the middle.

And so the idea was, well maybe you can take an Atari video game machine, where people plug in a game cartridge, and plug in a modem, and tie that into a telephone, and essentially turn that game in the machine into an interactive terminal.

I think it took us nine years to get one million subscribers to AOL, and then in the next nine years we went from one million to 35 million.

Today, National Geographic has a membership side with a magazine and some television side, and they generate about a billion dollars in revenue, and they're profitable. And so at the end of the year they have some bottom line profit which they can then reinvest, because they're running it as a not-for-profit in charitable endeavors.

The real magic in National Geographic isn't how much money they have left at the end of the year. It's the fact that through their overall focus they are reaching hundreds of millions of people and educating people about the world. It just happens to be done in a business-oriented kind of way that is more sustainable.

Because I do think - not just in building AOL - but just the world in which we live is a very confusing, rapidly changing world where technology has accelerated.

I do think that people have an obligation to give back but that doesn't necessarily mean that you give back just the traditional way. Maybe there's new ways to give back and make a contribution. I'm looking forward to some mix of philanthropy - maybe through a somewhat different prism - as well as helping entrepreneurs build some significant new businesses.