And that one thing is ...
"We're focused on doing one thing incredibly well. If you look at other companies, all of these companies are doing a lot of different things but we're still, as we grow, doing exactly one thing," she said.
... not security
"If that doesn't prove that [Facebook's] developers aren't thinking about security, I don't know what would."
-- An observer posting on Hacker News after Zuckerberg's personal photos were publicly revealed when a security flaw was exploited. Either Zuckerberg doesn't post his best photos at Facebook or the guy lives an incredibly boring life, playing with his dog and eating too much fried food.