Lawyers and other professionals are using Quora to build their reputation and build their bonafides.

Build your reputation by helping other people build theirs.

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

We need to build systems that can automatically figure out what's high quality and what's not, and encourage users to contribute high-quality content. There's a lot of technical challenges in that.

When we get people to log in, they end up using Quora a lot more, and we can provide a lot better experience for them. We can show them a personalized news feed; we can send them digest emails and do all this ranking to find some stuff they want to read.

Blogs are easy to start, but unless the author is famous, it takes years to build a following.