A request from the National Academies to prepare a presentation for a Workshop on Non-Technical Strategies to Protect Youth from Inappropriate Material on the Internet occurred before much was known about children, youth, and the Internet. The author's strategy was to investigate websites that cater to children and adolescents. The developmental issue of consumer socialization was raised by a visit to the Disney website. In contrast, the developmental issues of sexuality, aggression, and intergroup relations were raised by visits to chat rooms hosted by two different Internet Web portals. Examination of existing research literature, in conjunction with visits to the websites, led to the following conclusions: (1) Many parents are aware of the problems of making children the targets of commerce; however, they are quite unaware of the kind of social and cultural worlds young people are creating online. (2) Children and adolescents are not simply the targets of adult Internet creations; they are active participants in creating their own cybercultures, for example, in teen chat rooms. (3) The nature and norms of these cultures can be very much influenced by adult rules, regulations, and participatory monitoring. (4) The important developmental issues raised by this new medium are not unique to the Internet. For example, each psychosocial phenomenon from consumerism to sexuality to aggression has important manifestations in the culture at large.