Facebook is developing technology that would allow children younger than 13 years old to use the social-networking site under parental supervision, a step that could help the company tap a new pool of users for revenue but also inflame privacy concerns.

Mechanisms being tested include connecting children's accounts to their parents' and controls that would allow parents to decide whom their kids can "friend" and what applications they can use, people who have spoken with Facebook executives about the technology said. The under-13 features could enable Facebook and its partners to charge parents for games and other entertainment accessed by their children, the people said.

Facebook currently bans users under 13. But many kids lie about their ages to get accounts, putting the company in an awkward position regarding a federal law that requires sites to obtain verifiable parental consent before collecting personal data from children.

Any attempt to give younger kids access to the site would be extraordinarily sensitive, given regulators' already heightened concerns about how Facebook protects user privacy. But Facebook, concerned that it faces reputational and regulatory risks from children already using the service despite its rules, believes it has little choice but to look into ways of establishing controls that could formalize their presence on the site, people familiar with the matter said.

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