News is a media product subject to many pressures, influences and constraints. What is broadcast or written as news is a result of complex practical, ideological, cultural, economic and social factors.
Since Galtung and Ruge were writing, what is deemed newsworthy has changed. Celebrity news is now much bigger and there is a bigger focus today on good news. It has also become increasingly important for stories to be visually interesting, as video footage is deemed an important element of the news.
Other factors that have become more important include ensuring that advertisers are not offended or alienated by any political or otherwise controversial messages in the news.
A lot of UK news time is spent covering elections in the USA, much more so than on countries that are much closer to us, like Sweden or Portugal, and small countries on the other side of the world are often not reported on at all (unless there is some simple or unexpected bad news to tell).
Tight deadlines and limited budgets mean some stories are more attractive to journalists and editors than others. Stories that are easily accessible will be preferred to ones in distant countries. However, if a newspaper or TV programme has a permanent or regular correspondent in a particular city or country, then news stories there may well be reported that might otherwise not have been deemed important enough.
Television programmes in particular depend on being able to get useable video footage relating to a news story, and so are likely to reject stories that happen in far-off and inaccessible places.
Journalists have a limited range of views as they often speak to the same contacts and "experts" about particular topics, which is a practical consideration (as it is quick and cheaper) but may also have political and ideological foundations.
News stories can be handled briefly or extensively (with varying levels of analysis and investigation) not because of the merits or complexity of the story but because of the amount of time available in a news bulletin or space on a page.
Journalists and other media professionals decide what is considered significant or not in terms of the news. This will range from international stories to news from a national level. Different news corporations will set different agendas, as the content presented will differ depending on the audience and the priorities of the corporation itself.
Editors decide what is news and what is not. This is essentially a filtering process, based on practical considerations (such as space on a page) and other times it will be political or cultural or based on news values.
The news is not simply an unedited reflection of everything that happened on a given day. In that sense there is no question that the news is socially constructed.
Some news programmes try to take a step back and have a less strong editorial hand, but journalists and editors still choose what to show and what not to.
Marxist sociologists would argue that the agenda-setting and gate-keeping practices are intended to transmit ruling-class ideology or establish hegemony, seeing the choices about which news should be broadcast and which voices heard as being entirely political.
The media often target the powerful and the news can expose corruption and abuse of power, which is presented as an argument against the idea that the news is created and dominated by the powerful.
Modern technology has changed some of the practical restrictions on news, with smaller cameras and the ability for audience members to produce and share their own content. However, professional editors still act as gatekeepers to this user-generated content.
A high-profile public inquiry into the phone hacking scandal and associated cases of law-breaking and corruption by journalists, which led to proposals for a new independent regulatory body backed by legislation.
Most newspaper editors rejected the Leveson proposals and established IPSO in defiance of the government, with only small publications regulated by the rival organisation Impress.
While the UK media is not heavily censored, there is some censorship already, such as D-notices from the security services and court orders preventing the naming of certain individuals in articles.
There have been examples of direct government interference in television broadcasts, such as blocking reports and documentaries relating to the Northern Irish troubles, which suggests newspaper editors and journalists may have reason to fear state regulation.
However, it is also clear that the government has wanted more censorship of television broadcasts, which undermines the argument that state regulation would necessarily lead to greater censorship.
Bizarrely, there was a broadcast ban on members of paramilitary groups and Sinn Fein politicians which meant that actors had to "re-voice" their comments during broadcasts of interviews or speeches
A Channel 4 late-night discussion programme called After Dark invited the Sinn Fein leader Gerry Adams to appear, but Channel 4 withdrew the invitation, because other guests refused to appear
One of the reasons the IBA was wound up was because of government anger that it did allow the broadcast of a documentary, Death on the Rock about the SAS shooting of three unarmed members of the IRA in Gibraltar
They have the power to choose what to report and what to conceal
Pluralists and neo-pluralists would argue that decisions over what not to broadcast would be practical rather than political and that there is a diversity of newspapers so political views absent from one would be present in another
Marxists see the media as working on behalf of the ruling class to preserve the status quo