$FB Chief of Product Chris Cox is leaving the tech company, CEO Mark Zuckerberg announced. "Chris and I have worked closely together to build our products for more than a decade and I will always appreciate his deep empathy for the people using our services and the uplifting spirit he brings to everything he does," Zuckerberg wrote. Along with Cox, Zuckerberg announced that WhatsApp Vice President Chris Daniels is also leaving the company.