Justin Rosenstein

I do not doubt that services like social games and coupons bring delight to people's lives, and I mean no disrespect to the hard work that has made them possible. But in the face of threats to humanity's future on the one hand and the extraordinary potential of mankind on the other, at some point we must ask: are we capable of more?

When I ask people how much time they spend not doing their job - time spent on 'work-about-work' or phone calls or e-mails - people regularly tell me 60, or even 90 percent. So if Asana could take that down closer to zero, we could potentially double the effectiveness of humanity.

I really admire Airbnb as a pioneer of the sharing economy and for building community. They've found an elegant way to help hosts make more money and for guests to have authentic experiences. It brings those people together in a unique way.