The company's chief growth officer, Javier Olivan, will take over as COO after a transition period. But Mark Zuckerberg said his role will be less sweeping. "I don't plan to replace Sheryl's role in our existing structure. I'm not sure that would be possible since she's a superstar who defined the COO role in her own unique way. But even if it were possible, I think Meta has reached the point where it makes sense for our product and business groups to be more closely integrated, rather than having all the business and operations functions organized separately from our products," he said in a Facebook post.