They are the feuding offspring of Steve Jobs. They quarrel bitterly about the world he left behind when he died in 2011. In more peaceful times Steve would mentor Mark, then in his twenties, on long walks through the apricot groves of Silicon Valley. At the same time he was handing Tim, then aged 50, the keys to the technological kingdom.
Now Mark Zuckerberg, the co-founder and CEO of Facebook, is worth almost $130bn. Tim Cook is CEO of Apple and is worth only $1.3bn but he is currently winning the feud and Apple’s future looks more secure than Facebook’s. Apple is valued by the market at $2.3trn, Facebook a mere $998bn.