Facebook’s News Feed era is now officially over

Last May, after a decade of uncommon stability in his executive ranks, Mark Zuckerberg announced a series of dramatic changes. He moved two top executives to create a new blockchain division, and installed new leaders at WhatsApp and the News Feed. (He also appointed someone to run a new group focused on privacy initiatives, which was never heard from again.) And for Chris Cox, the company’s chief product officer and one of Zuckerberg’s most trusted lieutenants, the move represented