Re http://science.slashdot.org/story/13/09/06/1818241/humans-choose-friends-with-similar-dna … A confounding factor would be that (I suspect) most people live near people who are related to them.
Replying to @reiver
@reiver just reading the orig. paper. they controlled for the presence of relatives in the sample. (^_^) http://arxiv.org/abs/1308.5257
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