I developed and ran social networking features for a fashion site with an almost entirely female audience, age range 20-50. I was fully expecting bad behavior but was surprised as it grew that people were unfailingly nice, supportive and encouraging to each other, with only a few exceptions. Of course I'm aware that females, like anyone else, can be nasty to each other, but it barely happened here with membership in the thousands. It would be an interesting social experiement to replicate that on a larger scale while limiting the demographic by gender, age, and so on to see how it affects the behavior of the group.