In sociology, a friend of a friend is a human contact that exists because of a mutual friend. Person C is a friend of a friend of person A when there is a person B that is a friend of both A and C. Thus the human relation "friend of a friend" is a compound relation among friends, similar to the uncle and aunt relations of kinship.
In sociology, a friend of a friend is a human contact that exists because of a mutual friend. Person C is a friend of a friend of person A when there is a person B that is a friend of both A and C. Thus the human relation "friend of a friend" is a compound relation among friends, similar to the uncle and aunt relations of kinship.
Source: Wikipedia "Friend of a friend" · CC BY-SA 4.0
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