This is the aspect of the site that always made me scratch my head and say "huh?"
It is no doubt a well designed site that engages women. Despite being in beta and invite only I know a bunch of women who are really into it. I don't think being engaging is enough though - where do they go from here? How do they actually justify the valuation? Are they going to have "paid" posts for advertising? Are they going to some how sell the data mined from their users? Paid accounts?
This site seems like it is going to be even harder to monetize than reddit.