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'''Dunbar's number''' is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an [[individual]] knows who each person is and how each person relates to every other person.<ref name="dunbar92"/><ref>{{cite book |last=Gladwell |first=Malcolm |title=The Tipping Point – How Little Things Make a Big Difference |url=https://archive.org/details/tippingpointhowl00glad |url-access=registration |year= 2000 |publisher=Little, Brown and Company |isbn=978-0-316-34662-7 |pages=[https://archive.org/details/tippingpointhowl00glad/page/177 177]–181, 185–186}}</ref> This number was first proposed in the 1990s by British [[Anthropology|anthropologist]] [[Robin Dunbar]], who found a correlation between primate brain size and average social group size.<ref name="facebook study"/> By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.<ref>{{cite book|title=Principles of Cognitive Neuroscience|first=Dale|last=Purves|publisher=Sinauer Associates|location=Sunderland, Mass.|isbn=9780878936946|date=2008}}</ref> Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".<ref>{{cite book|url=https://archive.org/details/isbn_9780674363366|url-access=registration|title=Grooming, gossip, and the evolution of language|date=1998|publisher=Harvard University Press|isbn=978-0674363366|edition=1st Harvard University Press paperback|location=Cambridge, Massachusetts|page=[https://archive.org/details/isbn_9780674363366/page/77 77]|quote=|via=|last1=Dunbar|first1=Robin|accessdate=17 December 2016}}</ref>

'''Dunbar's number''' is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an [[individual]] knows who each person is and how each person relates to every other person.<ref name="dunbar92"/><ref>{{cite book |last=Gladwell |first=Malcolm |title=The Tipping Point – How Little Things Make a Big Difference |url=https://archive.org/details/tippingpointhowl00glad |url-access=registration |year= 2000 |publisher=Little, Brown and Company |isbn=978-0-316-34662-7 |pages=[https://archive.org/details/tippingpointhowl00glad/page/177 177]–181, 185–186}}</ref> This number was first proposed in the 1990s by British [[Anthropology|anthropologist]] [[Robin Dunbar]], who found a correlation between primate brain size and average social group size.<ref name="facebook study"/> By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.<ref>{{cite book|title=Principles of Cognitive Neuroscience|first=Dale|last=Purves|publisher=Sinauer Associates|location=Sunderland, Mass.|isbn=9780878936946|date=2008}}</ref> Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".<ref>{{cite book|url=https://archive.org/details/isbn_9780674363366|url-access=registration|title=Grooming, gossip, and the evolution of language|date=1998|publisher=Harvard University Press|isbn=978-0674363366|edition=1st Harvard University Press paperback|location=Cambridge, Massachusetts|page=[https://archive.org/details/isbn_9780674363366/page/77 77]|quote=|via=|last1=Dunbar|first1=Robin|accessdate=17 December 2016}}</ref>

Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".

Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. （加了一句话By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.[4]。）Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".