If I may, sir, just to back up, I think my colleague Rob was trying to get at that, but allow me to try.
The history of Facebook, as you probably know, is that it didn't start as a business. It was a project of our CEO when he was a student, and the intent was very much, as you point out, to try to connect friends. Over time that service has evolved. The core of what we do is still very much about connecting friends and family together. I think it's fair to say that at some point there was a need to monetize the platform. Advertising became a model that worked well for Facebook.
I would point out that if you roll back time to about 2014, it wasn't clear that advertising, especially mobile advertising, would work for Facebook. I would say, with all due respect, I think very much for all of us who work there and certainly for Rob and me, there was a sense of optimism—and perhaps we put too much in—in trying to help connect the world and make the world a more informed and more trusted community. I think those things are still very much our guiding north stars today.