Dunbar suggests that language evolved as a replacement for physical grooming.20 Language allows small groups of people to bond quickly and to learn from each other about the bonds of others. Dunbar notes that people do in fact use language primarily to talk about other people—to find out who is doing what to whom, who is coupling with whom, who is fighting with whom. And Dunbar points out that in our ultrasocial species, success is largely a matter of playing the social game well. It’s not what you know, it’s who you know.
