He’d said something about not over-googling health symptoms. And that had led to them talking about social media – he believed that the more people were connected on social media, the lonelier society became. ‘That’s why everyone hates each other nowadays,’ he reckoned. ‘Because they are overloaded with non-friend friends. Ever heard about Dunbar’s number?’ And then he had told her about a man called Robin Dunbar at Oxford University, who had discovered that human beings were wired to know only a hundred and fifty people, as that was the average size of hunter-gatherer communities. ‘And the
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