The recent celebration of the 75th anniversary of Radio Four’s Desert Island Discs cast me adrift on a sea of nostalgia. We would invariably listen to it on a Saturday evening after coming from high tea with my grandparents. And it suddenly strikes me with all the force of middle-age conviction that there never was anything so misnamed as social media: in that, unlike older media, none of it involves being in the same space as another and therefore, though it may use words like “sharing” and “reacting”, these are entirely solipsistic.