There was a snowstorm in New York this week, triggering the shutdown of schools, the excitement of children and, in my case, a flurry of activity on what has become a small but central drama in my life, Facebook Marketplace. There are better forums for buying and selling, and worthier ways to donate your old stuff. But for sheer theatre, it is hard to beat the personalised exchanges of a platform where you can low-key stalk the woman haggling for a 50% discount on your kid’s old snowsuit, to discover she has her apartment on the market for $5m. No deal, madam!

It goes without saying that the joy of the Marketplace has little to do with the money it generates. Facebook knows this, as it knows everything about us, starting with how venal we are. The thrill of the game is all, the slight but real satisfaction of offloading a clapped-out old scooter for actual cash money – as long as none of your Facebook friends see you doing it. To this end, there is a “hide listing from your friends” button that you are invited to hit when you publish a........

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