Good news for community operators: a US District Court judge has reaffirmed the basic principle that libelous comments create liability for the person who posted them and not the site operator.
"Persons who claim that they were harmed by a website's publication of user-generated content may sue the third-party user who generated that content, but they may not sue the interactive computer service that enabled the third-party user to publish the content online," Guirola wrote. "Thus, an interactive computer service is entitled to immunity as long as it did not create or author the particular information at issue."
There will never be a shortage of people wanting to use whatever coercive force is within reach, to suppress any voice they don't approve. But it's only the most evil people (medieval churchmen, communists, RIAA goons) that want to suppress entire technologies and social arrangements which MIGHT be used by someone they wouldn't approve.
In related news, civil engineering firm accused of facilitating drive-by shootings.
There are still caveats to the ruling... there remains in common law "intent" and "knowledge", and "abet" which if can be proved, will make the content provider liable. This ruling is NOT a get out of jail free card...