Laura

“That’s why everyone hates each other nowadays,’ he reckoned. ‘Because they are overloaded with non-friends friends. Ever heard about Dunbar’s number?’

And then he had told her about a man called Roger 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.”
― Matt Haig, The Midnight Library