Though not the first fictional detective, Sherlock Holmes is arguably the best-known. By the 1990s, over 25,000 stage adaptations, films, television productions, and publications had featured the detective, and Guinness World Records lists him as the most portrayed human literary character in film and television history. Holmes's popularity and fame are such that many have believed him to be not a fictional character but an actual individual; numerous literary and fan societies have been founded on this pretence. Avid readers of the Holmes stories helped create the modern practice of fandom. The character and stories have had a profound and lasting effect on mystery writing and popular culture as a whole, with the original tales, as well as thousands written by authors other than Conan Doyle, being adapted into stage and radio plays, television, films, video games, and other media for over one hundred years.