Elon Musk is widely considered the foremost entrepreneur of the era, a brilliant innovator who has brought electric cars to a mass market and made commercial space flight a reality.
But after agreeing to buy Twitter this week for $44bn, the world’s richest person has put himself at the centre of a politically toxic debate about free speech.
Why would such a restless individual swap dreams of one day colonising Mars for the more earthly pursuit of running a contested social media platform?
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