The playground rivalry between Mark Zuckerberg and Elon Musk dates back years—and in who-is-cooler-than-whom terms, Mr Musk usually wins easily. As an innovator, Mr Zuckerberg, co-founder of Facebook and boss of Meta, a social-media giant, has often been dismissed as a geeky dilettante in a hoodie. He has never received the Promethean kudos Mr Musk has for turning Tesla into a stallion of electric vehicles (EVs) and SpaceX into a rocket sensation. Mr Zuckerberg is notorious for his motto “move fast and break things”, which may have helped Facebook conquer the world but gave licence to critics to cast it as a social menace. Mr
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