NEW YORK — This past spring, 10-year-old Adam Young joined other tweens on Club Penguin, playing games, throwing virtual snowballs and chatting with fellow kids who appear onscreen as plump cartoon penguins. A few weeks later, Adam asked Mom to pay $5 a month for extra features, such as decorating his online persona's igloo.

Karen Young demanded to learn more about what some have billed as "training wheels" for the next MySpace generation. She spent time on the site with Adam and consulted with her sister, the mother of another daily visitor.

"I said, 'Well, what is it? What does it involve?'" Young recalled. "I wanted him to show me what he wanted and what it was about."

Drawing preteens as young as 6 or 7, sites like Club Penguin and Webkinz are forcing parents to decide at what age they are willing to let their children roam about and interact with friends online. They, along with schools, are having to teach earlier lessons on safety, etiquette and balance with offline activities.

"It's kind of like what happened in the real world with Cabbage Patch dolls and Beanie Babies," said Monique Nelson, executive vice president of Web Wise Kids, a nonprofit focused on Internet safety for children. "Their friends are doing it, so like kids who follow like sheep, they go online and go on these sites."

According to comScore Media Metrix, U.S. visitors to Club Penguin nearly tripled over the past year, while Webkinz' grew 13 times.

Peggy Meszaros, a professor of human development at Virginia Tech, said kids' identities begin to blossom by 8 and they start wanting to meet other children, so these sites may become their introduction to social networking. But she said kids that age would get much more "going to the swimming pool and meeting friends face to face," making parental oversight of online usage ever-important.

Young, a first-grade teacher in Louisville, Ky., ultimately deemed the environment relatively safe and agreed to pay for a membership. Unlike News Corp.'s MySpace, the anything-goes site frequented by Young's older son, Club Penguin limits what kids can say to one another, reducing the risks of predators and online bullying.

That sentiment was echoed by Tony Bayliss, father of 7-year-old Maisie in England. Club Penguin is the only site Bayliss lets Maisie visit unsupervised; Bayliss also has a cartoon penguin of his own and visits his daughter online while traveling.

"It's what the future is," Bayliss said of the online environment. "It's what she's going to be using for the rest of her life."