When you look at Yahoo Answers, there can be a lot of garbage. But if you're careful about the rules and supporting good contributions, over time you can get better and better, like Wikipedia.

The more questions and answers we get, the more useful Quora is.

The area we define as what Quora's good at is long-form text that's useful over time, and where you care about who wrote the text. Not that you need to be friends with them, just that they're someone trustworthy.

I have a view that if you build something that's good, and you keep making it better, it lasts.

When companies get big, they slow down. They're not as exciting. If you want to get something done, it takes a lot of time and a lot of meetings.

Wikipedia is kind of extreme, where a very, very small group of people contribute pretty much everything.