Sheryl Sandberg, Meta's former chief operating officer who served as CEO Mark Zuckerberg's top deputy, helping him transforming Facebook from a hot startup to a tech powerhouse, is leaving the company's board.X Sandberg, who joined Facebook in 2008, announced in a Facebook post that she will not stand for reelection in May, ending what she described as "an opportunity of a lifetime.""I will always be grateful to Mark for believing in me and for his partnership and friendship," Sandberg said. "He is that tru ...