That means the disappointing results have stood out in even greater contrast to the height of its pre-IPO expectations.

In recent weeks, talk turned to whether a seasoned business person , leaving 28-year-old Zuckerberg, with , to focus on the technology instead of running a major business venture.

Appearing on stage today, though, Zuckerberg came across as a calm man who has a plan for where to take his company. And his vision is largely focused right now on mobile.

And that's a good thing since there was quite a bit of pre-IPO doubt about Facebook's readiness to . In its pre-IPO documentation to the U.S. Securities and Exchange Commission (SEC), Facebook even listed mobile as one of its .

That's not how Zuckerberg sees it today.