from forbes.com: In her book Lean In, Sheryl Sandberg detailed her negotiations with Facebook CEO Mark Zuckerberg as she was being scouted for the position of chief operating officer. Poised to become the social network’s number two, the Harvard MBA noted that she was “dying” to accept the job but was “afraid of doing anything that might botch the deal.” “I could play hardball, but then maybe Mark would not want to work with me,” she wrote in a chapter titled “Success and Likeability.” “Was it worth it when I knew that ultimately I was going to accept the offer?” Six years after she took the job, Sandberg has reached another milestone. Facebook’s COO is now the world’s newest billionaire.