"media authorities" is correct and usable in written English.
You can use this term when referring to organizations and people who have a high level of influence in the world of media. For example, "The British media authorities are currently discussing ways to reduce the spread of harmful content online."
Remember when many in the New York metropolitan area — a fair number of news media authorities among them — scoffed at the notion of the Brooklyn Nets?
According to state media, authorities have shut factories within 125 miles (200km) of the city centre, and ordered all construction work to stop during the summit.
Media authorities were captured; the signal went out that journalists should not report in ways that violate the interests of the nation (which were equated with the interests of the governing party).
"We did in fact reach out to social media authorities to deactivate her account, to take it offline, if you will," the Baltimore County police chief, James Johnson, said on Tuesday.
In 1979 it amazed its readers by carrying a commercial advertisement: 10 years later, it broke new ground by publishing its own editorial comment on foreign news - instead of using the ones put out by the central media authorities in Beijing.
"This is probably what they cannot accept, the political, the economic and the media authorities in Greece.
The law establishes a national media authority with unprecedented powers over print, broadcast and online news media.
The media authority is an independent body; it does not take orders from either the government or the National Assembly.
Moreover, the independent court has the power to review all media authority decisions, thereby excluding any opportunity for exerting political pressure.
At the same time questions are being asked about whether the radio station broke the law – and whether the media authority regulator can, or will, punish them.
The Hungarian government is confident that the future legal practice of the media authority will dispel all doubts as to its respect of freedom of the press and public debate.
