Many-to-Many: the biases of links, in particular the differences between male and female bloggers.
This is a really interesting article (as is the ref to a bog about Blogher that Danah gives at the start.)
It seems that different systems have different gender balances as well, but is Live Journal 75% female, because of the sort of posts that predominate, or do the chatty sort of posts predominate because it’s mostly female.