As someone with a child in the US, this new Trump threat to scrutinise tourists’ social media is concerning. Providing my user name would be OK – the authorities would get sick of scrolling through chicken pics before they found anything critical of their Glorious Leader – but what if I have to hand over my phone at the border, as has happened to some travellers already? I would rather get deported.

There’s nothing criminal or egregiously immoral on there; I don’t foment revolution or indulge in Trump trolling, tempting as that would be. But my phone does not paint a flattering picture of me. Does anyone’s? Those shiny black rectangles have become contemporary confessionals, and we would like to believe they abide by the same kind of confidentiality rules.

There’s a jokey online trend of people posting pictures of themselves weeping, with the caption that their partner checked their phone for infidelity, but found “something much worse” – the next image reveals it’s the calculator app, used for infant-level arithmetic (15-9........

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