“There's a special place in hell for women who don't help other women,” writes Facebook CEO Sheryl Sandberg. The mean girls of Australian lunch rooms would be wise to take note. A 2010 survey by the Workplace Bullying Institute found that, while only 38 percent of bullies were female, female bullies targeted other women 80 percent of the time. In contrast, males tended to target both genders evenly. Women also face signi...