The career rise and life of Sheryl Sandberg, Facebook's billionaire chief operating officer who just announced she's engaged

· *Sheryl Sandberg is the chief operating officer for Facebook, and is worth an estimated $1.6 billion.*
· *Sandberg has made headlines in her nearly 10 years at Facebook, from pioneering a controversial feminist movement with her book "Lean In," to responding to criticism over the social media giant's handing of the Cambridge...