Craigslist is defending itself against charges by Connecticut Attorney General Richard Blumenthal that solicitations for prostitution are "rampant" on its Web site and demanding that Blumenthal retract statements it says are defamatory.
But the court said the Communications Decency Act protects Web sites from liability for third-party postings. It's the latest in a series of similar rulings.
A staff attorney for the Electronic Frontier Foundation, Kurt Opsahl, said the ruling was "good news."
The protection provided by the law is essential to the Internet's free operation, he said.