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The silence of Tesla’s board over the past two days after Elon Musk went on another Twitter tirade raises fresh questions about who has what it takes to oversee the unpredictable CEO.

A report on Thursday evening that Nigeria is playing hardball with MTN Group sent the wireless carrier’s shares tumbling more than 10% shortly after markets opened in Johannesburg on Friday.

Telecommunications carriers have long grumbled that they spend a fortune building the world’s data networks only to watch the US technology giants reap most of the benefits. Now they fear Silicon Valley will take away their customers, too.