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I attended a talk this year that Jimmy Wales gave at a local university, where he described wanting to actively increase the number of women contributing and editing Wikipedia. Barriers he cited included the fact that "Men are very comfortable making authoritative statements about things they know nothing about."
Ross Perlin's book presents a fairly comprehensive look at these issues, including illegality, nepotism, classism, etc.
1 Mole = 25 Cagey Bees