Here's an article in Techcrunch by Aileen Lee at Kleiner Perkins that fabulously summarizes the data on women's dominance in online consumption and social behaviors. Interestingly, the initial comments on this article bemoan Lee's observations as some sort of tiresome and perhaps icky feminism.
This misses the point. Lee is making the business case that women's behavior is the key to customer acquisition and revenue. She suggests that companies spend more time making sure their female customers are happy with product/service offerings. This all seems obvious, but given the comment thread of resistance, it may be still be a winning and differentiating strategy.