Predators on MySpace, drive-by porn on YouTube, pervasive sexting, pop-idol vacuous value systems, self-esteem crushing reinforcement of preferred body-type hegemonies, and general lack of female role models. What’s the parent of a tween girl to do? If you’re Hilary DeCesare, or one of her cofounder moms, you take matters into your own hands and set up GirlAmbition.com, a website for tween girls a concerned parent can be comfortable with.