In the late 20th Century, mass media could be classified[by whom?] into eight mass media industries: books, newspapers, magazines, recordings, radio, movies, television and the internet. With the explosion of digital communication technology in the late 20th and early 21st centuries, the question of what forms of media should be classified as "mass media" has become more prominent. For example, it is controversial whether to include cell phones, video games and computer games (such as MMORPGs) in the definition. In the 2000s, a classification called the "seven mass media" became popular. In order of introduction, they are:

Print (books, pamphlets, newspapers, magazines, etc.) from the late 15th century
Recordings (gramophone records, magnetic tapes, cassettes, cartridges, CDs, DVDs) from the late 19th century
Cinema from about 1900
Radio from about 1910
Television from about 1950
Internet from about 1990
Mobile phones from about 2000
Each mass media has its own content types, its own creative artists and technicians, and its own business models. For example, the Internet includes web sites, blogs, podcasts, and various other technologies built on top of the general distribution network. The sixth and seventh media, internet and mobile, are often called collectively as digital media; and the fourth and fifth, radio and TV, as broadcast media. Some argue that video games have developed into a distinct mass form of media.[6]

While a telephone is a two way communication device, mass media refers to medium which can communicate a message to a large group, often simultaneously. However, modern cell phones are no longer a single use device. Most cell phones are equipped with internet access and capable of connecting to the web which itself is a mass medium. A question arises of whether this makes cell phones a mass medium or simply a device used to access a