It takes oodles of insouciance and ambition to exploit two global institutions in the way that Alexander Nix, CEO of Cambridge Analytica, has done with Facebook and Cambridge University. But then they teach self-assurance at Eton College, the school he attended, in common with various UK prime ministers. Nix, who was suspended from his job on Tuesday, is now persona non grata at Facebook, having contributed to a sharp fall in its value by exposing its lax control over 2-billion users’ personal data. Nor is he popular with the university whose name his company adopted and whose research informed its work on Donald Trump’s election campaign. One lesson here is to beware Eton-educated executives with posh accents and good suits. "It is very flattering that … people might see us as having these incredible powers," Nix told parliament in February. Perhaps, but he was the conjuror of the illusion. If not Nix, it would have been someone equally brazen. Once Facebook found a way to get into...

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