The conclusions here – the fruits of over seven years of research – build on the insight that modern humans live in effective social groups of about 150 (so-called ‘Dunbar’s number’), some three times the size of those of apes and our early ancestors. We live in a world dominated by social networking. Yet our virtual contact lists, whether on Facebook or Twitter, are on average no bigger than Dunbar’s number.
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Brian Fagan, Emeritus Professor of Anthropology, University of California
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Clive Gamble is a British archaeologist and anthropologist, and Professor of Archaeology at Southampton University. He has been described as the 'UK’s foremost archaeologist investigating our earliest ancestors'.
John Gowlett is Professor of Archaeology, Classics and Egyptology at Liverpool University. He is involved in fieldwork in eastern and southern Africa.
Robin Dunbar is a British anthropologist and evolutionary psychologist specialised in primate behaviour. He is currently head of the Social and Evolutionary Neuroscience Research Group in the Department of Experimental Psychology at the University of Oxford. He is best known for formulating Dunbar's number, a measurement of the 'cognitive limit to the number of individuals with whom any one person can maintain stable relationships'.
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