Why do women blog less?

Interesting discussion about diversity in the blogosphere going on at Tony Karrer's blog.

Why do you think that women blog less than men? Do women like the personal nature of conversation? If blogs are similar to diaries why do men blog more than women? Surely the opposite would be case?

Are blogs a way for men to show their knowledge and women aren't interested in 'showing off''? Many theories and opinions out there...

I would love to hear from women!