"The biggest mistake we made as a company was betting too much on HTML5." — Mark Zuckerberg

We talk about this concept of openness and transparency as the high-level ideal that we're moving towards at Facebook. The way that we get there is by empowering people to share and connect. The combination of those two things leads the world to become more open.

I think we basically saw that the messaging space is bigger than we'd initially realized, and that the use cases that WhatsApp and Messenger have are more different than we had thought originally.

I feel that the best companies are started not because the founder wanted a company but because the founder wanted to change the world... If you decide you want to found a company, you maybe start to develop your first idea. And hire lots of workers.

I always tell people that you should only hire people to be on your team if you would work for them.