Of all the many wellness gurus to have emerged in recent weeks, the spectral figure of Jack Dorsey, better known as the 42-year-old CEO of Twitter and founder of mobile payments company Square, has been by far the most disturbing.  First, there’s the strange affectation of the beard. A salt-and-pepper thatch of chin fluff, of a length more commonly associated with eastern mystics or cult leaders, it lends him the appearance of Gandalf the Grey, though Dorsey seems slightly more haunted in demeanour. Then there’s the new rig-out. He has cast out the loafers, unbuttoned white shirt and roadie’s Perfecto jacket to don a black hoodie, beanie and black trousers. It’s the sort of garb adopted by action heroes in that section of the film where they train under the auspices of a “master” mentor while awaiting some sign of transcendental enlightenment — or weaponry — that will see them on their journey. But Dorsey’s role as Silicon Valley soothsayer has only been fully realised via an 11-po...

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