There is one point around Greg's story about diversities between genders.
Men enjoy in playing war (with real guns, paintball, football, edit war, argument war...). Women enjoy in playing less aggressive games. The only games available on Wikipedia are games for men. Facebook is different. At the basic level, there are games for everyone: men can enjoy argument wars, women can enjoy in searching what is going on with their people around them.
That means that we need games for women. While I think that we should build full social network, just a basic one would help.