this is a very interesting study by Shawndra Hill (now a professor at U Penn):
http://arxiv.org/PS_cache/math/pdf/0606/0606278v2.pdf
very interesting study on social graphs and buying behavior
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this is a very interesting study by Shawndra Hill (now a professor at U Penn):
http://arxiv.org/PS_cache/math/pdf/0606/0606278v2.pdf