In the United States, newspaper proprietors first became prominent in the 19th century with the development of mass circulation newspapers. In the 20th century, proprietorship expanded to include ownership of radio and television networks, as well as film studios, publishing houses, and more recently internet and other forms of multimedia companies. Reflecting this, the term "press baron" was replaced by "media baron", and the term "media mogul" (or "Hollywood mogul" when applied to people specifically working in the motion picture industry, having actually spawned a similarly named computer game) was popularized in colloquial English.