People wait until late in their career to give back. But why wait when there is so much to be done?

I look at Google and think they have a strong academic culture. Elegant solutions to complex problems.

Advertising works most effectively when it's in line with what people are already trying to do. And people are trying to communicate in a certain way on Facebook - they share information with their friends, they learn about what their friends are doing - so there's really a whole new opportunity for a new type of advertising model within that.

We're really at this point where we can take a step back and think about the next big things that we want to do.

I don't have an alarm clock. If someone needs to wake me up, then I have my BlackBerry next to me.

We are working hard to build a service that everyone, everywhere can use, whether they are a person, a company, a president or an organisation working for change

Openness fundamentally affects a lot of the core institutions in society - the media, the economy, how people relate to the government and just their leadership.