One thing that I think is really important — that I think is context for this, is that I generally think that most other companies now are undervaluing how important social integration is. So even the companies that are starting to come around to thinking, ‘oh maybe we should do some social stuff’, I still think a lot of them are only thinking about it on a surface layer, where it’s like “OK, I have my product, maybe I’ll add two or three social features and we’ll check that box”. That’s not what social is.
Social – you have to design it in from the ground up. These experiences, like what Zynga is doing or what a company like Quora is doing, I think that they have just a really good social integration. They’ve designed their whole product around the idea that your friends will be here with you. Everyone has a real identity for themselves. And those are fundamental building blocks.
From TechCrunch’s Interview With Mark Zuckerberg On The “Facebook Phone”.