The shakeup appeared to consolidate power at the sprawling internet company, although it included no firings or outside hires and did not change the role of either Zuckerberg or Chief Operating Officer Sheryl Sandberg.

Chris Cox, the chief product officer in charge of the flagship Facebook service, will now also oversee the widely used services Instagram, Messenger and WhatsApp, the company said.

WhatsApp has been given a relatively free hand since 2014, when Facebook bought it for $22 billion, but in recent months its two co-founders have announced their resignations, opening the door to closer integration.