Wikipedia's first sentence called it “real or perceived tendency of journalists and news producers within the mass media to approach both the present”. Today it says “widely disputed”. The one-line description Wikipedia serves to search engines and AI systems read “Bias or perceived bias of journalists and news producers within the mass”. It now reads “Bias within the mass media”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since.Pale dots: rewritten; the numbered note shows what it says now.Red text: written in or rewritten since the previous snapshot.1 tap a number or a side note to jump between them
The opening as it read in 2005
Media bias is a real or perceived tendency of journalists and news producers within the mass media to approach both the presentation of particular stories, and the selection of which stories to cover, with an unbalanced perspective. In essence, "media bias" generally refers to accusations of either censorship or propagandism on the part of particular news sources, where such content is framed in the light of a preconceived agenda. Categories of bias are: Ethnic bias : Includes nationalism and regionalism . Corporate bias : Including advertising , political campaigns, the reporting of issues to favor a station's corporate economic interests. Social bias : Social and class divisions, within the context of a report, or the overall bias of reporting to favor the status class. Political bias: Regarding the split in political slant. Sensationalism : Which tends to supersede other biases, and manufacture or distort news as a purely commercial "product."1
This is Wikipedia's own text, saved in our repository. Their copy of it is revision 15916025.
The opening as it stood in 2010 7 passages from the previous snapshot no longer appear
Media bias refers to the bias of journalists and news producers within the mass media , in the selection of which events and stories are reported and how they are covered.The term "media bias" implies a pervasive or widespread bias contravening the standards of journalism , rather than the perspective of an individual journalist or article.The direction and degree of media bias in various countries is widely disputed.Practical limitations to media neutrality include the inability of journalists to report all available stories and facts, and the requirement that selected facts be linked into a coherent narrative (Newton 1989).Since it is impossible to report everything, selectivity is inevitable.Government influence, including overt and covert censorship , biases the media in some countries.Market forces that result in a biased presentation include the ownership of the news source, concentration of media ownership , the selection of staff , the preferences of an intended audience , and pressure from advertisers .There are a number of national and international watchdog groups that report on bias in the media.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 370394663.
The opening as it stood in 2015 1 passage from the previous snapshot no longer appear
Media bias is the bias or perceived bias of journalists and news producers within the mass media in the selection of events and stories that are reported and how they are covered. The term "media bias" implies a pervasive or widespread bias contravening the standards of journalism , rather than the perspective of an individual journalist or article. The direction and degree of media bias in various countries is widely disputed. Practical limitations to media neutrality include the inability of journalists to report all available stories and facts, and the requirement that selected facts be linked into a coherent narrative. Government influence, including overt and covert censorship , biases the media in some countries, for example North Korea and Burma . Market forces that result in a biased presentation include the ownership of the news source, concentration of media ownership , the selection of staff , the preferences of an intended audience , and pressure from advertisers . There are a number of national and international watchdog groups that report on bias in the media.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 668630770.
The opening as it stood in 2020
Bias or perceived bias of journalists and news producers within the mass media in the selection of events and stories that are reported and how they are covered ( Learn how and when to remove this message ) Media bias is the bias or perceived bias of journalists and news producers within the mass media in the selection of many events and stories that are reported and how they are covered. The term "media bias" implies a pervasive or widespread bias contravening the standards of journalism , rather than the perspective of an individual journalist or article. The direction and degree of media bias in various countries is widely disputed. Practical limitations to media neutrality include the inability of journalists to report all available stories and facts, and the requirement that selected facts be linked into a coherent narrative. Government influence, including overt and covert censorship , biases the media in some countries, for example China , North Korea and Myanmar . Market forces that result in a biased presentation include the ownership of the news source, concentration of media ownership , the subjective selection of staff , the preferences of an intended audience , There are a number of national and international watchdog groups that report on bias of the media.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 962769617.
The opening as it stood on October 6, 2023
Bias within the mass media Media bias is the bias of journalists and news producers within the mass media in the selection of many events and stories that are reported and how they are covered. The term "media bias" implies a pervasive or widespread bias contravening of the standards of journalism , rather than the perspective of an individual journalist or article. The direction and degree of media bias in various countries is widely disputed. Practical limitations to media neutrality include the inability of journalists to report all available stories and facts, and the requirement that selected facts be linked into a coherent narrative . Government influence, including overt and covert censorship , biases the media in some countries, for example China , North Korea , Syria and Myanmar . Politics and media bias may interact with each other; the media has the ability to influence politicians, and politicians may have the power to influence the media.This can change the distribution of power in society.Examples include bias introduced by the ownership of media, including a concentration of media ownership , the subjective selection of staff , or the perceived preferences of an intended audience . There are a number of national and international watchdog groups that report on bias of the media.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1178376610.
The opening as it stood in 2025 2 passages from the previous snapshot no longer appear
Bias within the mass media sidebar Media bias occurs when journalists and news producers show bias in how they report and cover news. The term "media bias" implies a pervasive or widespread bias contravening of the standards of journalism , rather than the perspective of an individual journalist or article. The direction and degree of media bias in various countries is widely disputed. Practical limitations to media neutrality include the inability of journalists to report all available stories and facts, and the requirement that selected facts be linked into a coherent narrative . Government influence, including overt and covert censorship , biases the media in some countries, for example China , North Korea , Syria and Myanmar . Politics and media bias may interact with each other; the media has the ability to influence politicians, and politicians may have the power to influence the media. This can change the distribution of power in society. Examples include bias introduced by the ownership of media, including a concentration of media ownership , the subjective selection of staff , or the perceived preferences of an intended audience . Assessing possible bias is one aspect of media literacy , which is studied at schools of journalism, university departments (including media studies , cultural studies , and peace studies ).Other focuses beyond political bias include international differences in reporting, as well as bias in reporting of particular issues such as economic class or environmental interests.Academic findings around bias can also differ significantly from public discourse and understanding of the term.PMID 27824947 . : CS1 maint: article number as page number ( link ) Mackey, Thomas P.; Jacobson, Trudi E.Metilerate Learning for the Post-Truth World .Committee to Protect Journalists .In Kenski, Kate; Jamieson, Kathleen Hall (eds.).The Oxford Handbook of Political Communication .In academic circles, media bias is referenced more often as a hypothesis to explain patterns of news coverage than as a component of any fully elaborated theory of political communication.
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1295914352. This is our newest snapshot; the live article may have moved again since.
Today
Wikipedia's first sentence called it “real or perceived tendency of journalists and news producers within the mass media to approach both the present”. Today it says “widely disputed”. The one-line description Wikipedia serves to search engines and AI systems read “Bias or perceived bias of journalists and news producers within the mass”. It now reads “Bias within the mass media”. Read the current article and compare.
2005
2010
2015
2020
Oct '23
2025
disputed
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Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.
What Wikipedia says this is
Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.
Then
real or perceived tendency of journalists and news producers within the mass media to approach both the present
Now
widely disputed
Sections that no longer exist
Present on October 6, 2023, absent today, with no near-matching heading in the current article and the article shorter overall, so this is not a renamed heading or a topic absorbed into a fuller treatment. 9 sections of 400 characters or more gone since October 6 2023, with the article 22,782 characters shorter.
Confirmation bias
Time biased media and Space biased media
United States political bias
Scholarly treatment in the United States and United Kingdom
Identifying bias
National and ethnic viewpoint
Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.