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Social groups are fundamental building blocks of human societies. While our social interactions have always been constrained by geography, it has been impossible, due to practical difficulties, to evaluate the nature of this restriction on social group structure. We construct a social network of individuals whose most frequent geographical locations are also known. We also classify the individuals into groups according to a community detection algorithm. We study the variation of geographicaldoi:10.1371/journal.pone.0016939 pmid:21483665 pmcid:PMC3071679 fatcat:xpt3kf2lvjesfnolaxhbq23xhq