Investigators set up profiles as 12- to 14-year-olds, and the decoys were quickly contacted by other users seeking sex, Cuomo said. On several occasions, Facebook did not respond to written complaints, he said.

Cuomo joins several state attorneys general in raising questions about social-networking sites and how well they protect users from predators. Connecticut's Richard Blumenthal has said civil lawsuits against MySpace, Facebook and others are possible.

The New York investigators said Facebook did, in some instances, take down pages in response to their messages about inappropriate communications and content. But other complaints about user groups hosting "hardcore pornography" were ignored, Cuomo said.

"My office is concerned that Facebook's promise of a safe Web site is not consistent with its performance in policing its site and responding to complaints," he said. "Parents have a right to know what their children will encounter on a Web site that is aggressively marketed as safe."

Facebook spokesman Brandee Barker said the states' concerns are being taken "very seriously."

"As our service continues to grow so does our responsibility to our users to empower them with the tools necessary to communicate efficiently and safely," Barker said. "We strive to uphold our high standards for privacy on Facebook and are constantly working on processes and technologies that will further improve safety and user control on the site."

On Monday, Cuomo released a letter to Facebook over its safety claims. Those concerns are based on several "undercover tests" in recent weeks, he said. The subpoenas seek copies of complaints made to the company as well as its relevant policies.

Blumenthal said Cuomo's work "advances our common effort because it will likely produce additional information."

MySpace did not return a telephone call seeking comment.

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