Book excerpt: Based on four years of experience teaching computers to 8-12 year olds, media scholar Ellen Seiter offers parents and educators practical advice on what children need to know about the Internet and when they need to know it. The Internet Playground argues that, contrary to the promises of technology boosters, teaching with computers is very difficult. Seiter points out that the Internet today resembles a mall more than it does a library. While children love to play online games, join fan communities, and use online chat and instant messaging, the Internet is also an appallingly aggressive marketer to children and, as this book passionately argues, an educational boondoggle.