The lawsuit filed Thursday in Los Angeles challenges a Facebook feature that allows members to note that they like an advertised service or product. Facebook broadcasts those endorsements to the user's friends.
The lawsuit also claims minors unwittingly endorse Facebook when people typing their names in a search engine are steered to a Facebook sign-up page.
The plaintiffs say Palo Alto-based Facebook is violating a California law that requires parental consent for children to make commercial endorsements. The teens seek unspecified damages.
Facebook spokesman Andrew Noyes says the lawsuit is meritless. He notes Facebook doesn't allow users under 18 to let their profiles appear on public search engines.