Dart v. Craigslist, Inc., 665 F. Supp. 2d 961 (N.D. Ill. 2009)
The Sheriff of Cook County sued Craigslist arguing that the site's "adult" or "erotic" services section facilitated prostitution and created a public nuisance. The sheriff argued that "Craigslist plays a more active role than an intermediary or a traditional publisher... [because it] causes or induces its users to post unlawful ads-by having an 'adult services' category" and enables users to search by sexual preference. But the court held that Craigslist did not cause or induce illegal conduct: erotic services could include lawful speech protected by the First Amendment and the section featured warnings not to post prostitution-related ads. CDA § 230 therefore barred the sheriff's claims.