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Mike Schroepfer, a 13-year veteran who oversees the social network’s work in artificial intelligence, virtual reality and the blockchain, will step down next year.

A series of public spats between South African cabinet ministers, state companies and departments are exposing divisions in the ruling party and risk spooking investors in an economy the central bank forecasts will record zero growth this year.

Inside a packed Vodafone Group store in the Zambian capital of Lusaka, a group of the city’s tech-savvy students wait in line for wireless modems they hope will transform their ability to surf the Internet. They don’t even