In a series of obscenity-laced tirades, the bloggers, among other things, pointed to Cahill's "obvious mental deterioration," and made several sexual references about him and his wife, including using the name "Gahill" to suggest that Cahill, who has publicly feuded with Smyrna Mayor Mark Schaeffer, is homosexual.

In June, the lower court judge ruled that the Cahills had established a "good faith basis" for contending that they were victims of defamation and affirmed a previous order for Comcast to disclose the bloggers' identities.

Under the standard adopted by the Supreme Court, a plaintiff must first try to notify the anonymous poster that he is the subject of subpoena or request for a court to disclose his identity, allowing the poster time to oppose the request. The plaintiff would then have to provide prima facie evidence of defamation strong enough to overcome a summary judgment motion.

"The decision of the Supreme Court helps provide protection for anonymous bloggers and anonymous speakers in general from lawsuits which have little or no merit and are filed solely to intimidate the speaker or suppress the speech," said David Finger, a Wilmington attorney representing John Doe No. 1.

Steele noted in his opinion that plaintiffs in such cases can use the Internet to respond to character attacks and "generally set the record straight," and that, as in Cahill's case, blogs and chatrooms tend to be vehicles for people to express opinions, not facts.

"Given the context, no reasonable person could have interpreted these statements as being anything other than opinion. ... The statements are, therefore, incapable of a defamatory meaning," he wrote.