Much of Facebook's phenomenal success can be attributed to the company's chief operating officer, Sheryl Sandberg. Insiders say Sandberg has developed a close relationship with CEO Mark Zuckerberg that lets her guide him and ensure that his shyness and lack of experience don't take a toll on the company. Still, some critics say she should be doing more to rein in Zuckerberg on issues such as user privacy. "I fear that Ms. Sandberg is failing to provide the adult supervision that Facebook requires," says Jeff Chester, executive director of the Center for Digital Democracy.

Related Summaries