(20 ) Mark Zuckerberg | Facebook : Mark Zuckerberg� June�1�at�9:36�PM� � It's the end of an era. After 14 years, my good friend and partner Sheryl Sandberg is stepping down as COO of Meta. When Sheryl joined me in 2008, I was only 23 years old and I barely knew anything about running a company. We'd built a great product -- the Facebook website -- but we didn't yet have a profitable business and we were struggling to transition from a small startup to a real organization. Sheryl architected our ads business, hired great people, forged our management culture, and taught me how to run a company. She created opportunities for millions of people around the world, and she deserves the credit for so much of what Meta is today. It's unusual for a business partnership like ours to last so long. I think ours did because Sheryl is such an amazing person, leader, partner, and friend. She cares deeply about the people in her life and she is generous about nurturing relationships...