Has anyone ever been held liable in the United States for encouraging acts of violence on the World Wide Web?
Yes. In 1999, a coalition of groups opposed to abortion was ordered to pay over $100 million in damages for providing information for a Web site called "Nuremberg Files," a site which posed a threat to the safety of a number of doctors and clinic workers who perform abortions. The site posted photos of abortion providers, their home addresses, license plate numbers, and the names of their spouses and children. In three instances, after a doctor listed on the site was murdered, a line was drawn through his name. Although the site fell short of explicitly calling for an assault on doctors, the jury found that the information it contained amounted to a real threat of bodily harm.