I generally think if you do good things for people in the world, that comes back and you benefit from it over time.

Google, I think, in some ways, is more competitive and certainly is trying to build their own little version of Facebook.

More than four million businesses have Pages on Facebook that they use to have a dialogue with their customers.

Advertising works most effectively when it's in line with what people are already trying to do.

A squirrel dying in front of your house may be more relevant to your interests right now than people dying in Africa.

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

Stuff like photos and events and groups - we've built pretty basic versions of those apps to start but they ended up being so much more used because of their social integrations.