It's a day of high intrigue at Facebook headquarters, with CFO Gideon Yu leaving abruptly. So why was former COO Owen Van Natta, who left last year, spotted walking out of a Facebook office?

Mean-mom Facebook COO Sheryl Sandberg, bringer of order to Mark Zuckerberg's children's crusade, has turned the too-cool-for-school startup into a place where employees fill out employee surveys. At Facebook, though, they call them "awesomeness" surveys.