Former top Facebook Inc. deputy Chris Cox is returning to the social-media giant, just over a year after leaving amid disagreements with CEO Mark Zuckerberg over the company’s direction.

Mr. Cox, who was one of Facebook’s earliest engineers, announced his plans to return as the company’s head of product, the job he resigned in March 2019. The core of the role is executing Mr. Zuckerberg’s vision for Facebook’s platforms, and Mr. Cox was known to have disagreed with the CEO’s plans to move toward unifying the company’s products…

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