Time magazine, the first weekly news magazine in the United States, debuted in 1923.
Four years later, in 1927, Warner Bros. released the world's first feature-length talking picture, The Jazz Singer.
In 1963, recommendations from Time Inc. based on how it delivered magazines led to the introduction of ZIP codes by the United States Post Office.
In 1972, Kinney National Company spun off its non-entertainment assets due to a financial scandal over its parking operations and renamed itself Warner Communications Inc.
It was the holding company for Warner Bros. Pictures and Warner Music Group during the 1970s and 1980s. It also owned DC Comics and Mad, as well as a majority stake in Garden State National Bank (an investment it was ultimately required to sell pursuant to requirements under the Bank Holding Company Act). Warner's initial divestiture efforts led by Garden State CEO Charles A. Agemian were blocked by Garden State board member William A. Conway in 1978; a revised transaction was later completed in 1980.
In 1975, Home Box Office (HBO) became the first TV network to broadcast nationally via satellite, debuting with the Muhammad Ali and Joe Frazier "Thrilla in Manila" boxing match.
In 1975, Warner expanded under the guidance of CEO Steve Ross and formed a joint venture with American Express, named Warner-Amex Satellite Entertainment, which held cable channels including MTV (launched 1981), Nickelodeon (launched 1979) and The Movie Channel. Warner Bros. bought out American Express's half in 1984, and sold the venture a year later to Viacom, which renamed it MTV Networks.
In 1976, the Turner–owned WTCG originated the "superstation" concept, transmitting via satellite to cable systems nationwide and pioneering the basic cable business model. WTCG was renamed WTBS in 1979 (it is now Meredith-owned WPCH).
In 1976, Nolan Bushnell sold Atari, Inc. to Warner Communications for an estimated $2–12 million. Warner made considerable profits (and later losses) with Atari, which it owned from 1976 to 1984. While part of Warner, Atari achieved its greatest success, selling millions of Atari 2600s and computers. At its peak, Atari accounted for a third of Warner's annual income and was the fastest-growing company in the history of the United States at the time.
In 1980, Warner purchased The Franklin Mint for about $225 million. The combination was short lived: Warner sold The Franklin Mint in 1985 to American Protection Industries Inc. (API) for $167.5 million. However, Warner retained Franklin Mint's Eastern Mountain Sports as well as The Franklin Mint Center, which it leased back to API.
In 1980, Turner launched CNN, the first 24-hour all-news network, redefining the way the world received breaking news.
In January 1983, Warner expanded their interests to baseball. Under the direction of Caesar P. Kimmel, executive vice-president, bought 48 percent of the Pittsburgh Pirates for $10 million. The company then put up its share for sale in November 1984 following losses of $6 million due to its failed attempt to launch a cable sports package. The team's majority owner, John W. Galbreath, soon followed suit after learning of Warner's actions. Both Galbreath and Warner sold the Pirates to local investors in March 1986.
In 1984, due to major losses spurred by subsidiary Atari Inc.'s losses, Warner sold Atari Inc.'s Consumer Division assets to Jack Tramiel. It kept the rest of the company and named it Atari Games, eventually reducing it to just the Coin Division. They sold Atari Games to Namco in 1985, and repurchased it in 1992, renaming it Time Warner Interactive, until it was sold to Midway Games in 1996. In a long-expected deal, Warner Communications acquired Lorimar-Telepictures; the acquisition was finalized on January 12, 1989.