Virtual communities have been extensively examined -- including their history, how to define them, how to design tools to support them, and how to analyze them. However, most of this research has focused on adult virtual communities, ignoring the unique considerations of virtual communities for children and youth. Young people have personal, social, and cognitive differences from adults. Thus, while some of the existing research into adult virtual communities may be applicable, it lacks a developmental lens. Based on our work of designing and researching virtual worlds for youth, we describe