I guess the owners of the Grand Resort Hotel in Pigeon Forge, Tennessee have never heard of the Streisland Effect. Their attempt to sue Trip Advisor for defamation based on the hotel’s inclusion in Trip Advisor’s annual “Dirtiest Hotels” list was dismissed by the federal district court for the Eastern District of Tennessee. While facts can be defamatory, opinions can not. The court concluded that no “reasonable person could believe that TripAdvisor’s article reflected anything more than the opinions of TripAdvisor’s millions of online users.”
Professor Eric Goldman discusses this case in more detail here.