Let's probe some ancient history for a moment: In the days before Twitter and Instagram, how did the man on the street obtain breaking news? Well, one way was via the extra editions of newspapers, often printed on one side only, which in Japanese are referred to as 号外 (gōgai, extra editions).
To see actual extras of major historical events, I recommend a visit to the 日本 新聞博物館 (Nihon Shinbun Hakubutsukan, Japan Newspaper Museum), also referred to as ニュースパーク (Nyūsu Pāku, News Park), just above 日本大通り駅 (Nihon-Ōdōri Eki, Nihon-Odori Station) in Yokohama's Naka Ward. It's been undergoing renovations since last year and is scheduled to reopen on July 20.
One of the oldest forms of electronic media, whose introduction actually predated radio broadcasts, was the "news ticker." The world's best known was almost certainly the Motograph News Bulletin — nicknamed "The Zipper" — in New York's Times Square. Originally illuminated by a panel of 14,800 light bulbs, it made its debut on Nov. 6, 1928, to announce Herbert Hoover's victory over Al Smith in that year's U.S. presidential election.