A federal judge has thrown out a lawsuit aimed at driving classified ads for prostitution off the Craigslist Web site. U.S. District Court Judge John Grady said not all postings on the Craigslist "Adult Services" section advertised prostitution and that other services could legitimately appear there.

"A woman advertising erotic dancing for male clients is offering an adult service, yet this is not prostitution," he said in a 31-page opinion Tuesday.