Zuckerberg also announced the departure of Chris Daniel, who helped Facebook define the business model for WhatsApp going forward.
Citing six sources, The Times reported that Cox "disagreed with some of Mr. Zuckerberg's product ideas and changes, including the "unified messaging" project meant to connect the apps".
Cox joined Facebook in 2005 and is largely responsible for the News Feed, one of Facebook's foundational features. As it navigates this transition, Facebook plans to stop telling investors the user numbers for its main social-networking platform alone, choosing instead to disclose an aggregate number of users for Facebook and its WhatsApp, Instagram and Messenger apps.
"While it is sad to lose such great people, this also creates opportunities for more great leaders who are energized about the path ahead to take on new and bigger roles", Zuckerberg said. The resignations have been publicly linked to tension between Zuckerberg and other C-suites over the direction of the company in addition to the number of data scandals Facebook has found itself caught up in of late.
Top global travel hub Dubai bans Boeing 737 MAX
The US National Transportation Safety Board will also have an influential role as representative of the country of manufacture. Airline passengers FOX 5 spoke with are applauding the decision to ground all MAX 8 and 9 planes in the United States.
Zuckerberg said in a blog post that chief product officer Chris Cox, one of the firm's earliest employees, and Whatsapp vice president Chris Daniels had resigned.
The company does not immediately plan to appoint anyone to fill Cox's role in the near term, he said. 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. Daniels will be replaced by Will Cathcart as the head of WhatsApp, however.
After CEO Mark Zuckerberg and COO Sheryl Sandberg, Cox is the third highest-ranking executive at Facebook, representing the engineering and product sides of the company.
"This is an important change as we begin the next chapter of our work building the privacy-focused social foundation for the future".
The Facebook app will be overseen by Fidji Simo, who led the team for much of the past year while Cathcart was on paternity leave.
The steady loss of executive talent come amid a painful two year period Facebook has been vilified for abusing user privacy and summoned to testify about the prevalence of fake news and unsafe political ads on its sites.