Ad Fontes Media

Ad Fontes Media is a Colorado-based media watchdog and public benefit corporation that evaluates news and other media for political bias and reliability. It is best known for the Media Bias Chart, a visual ranking system that places media sources on a horizontal scale ranging from left to right political bias and a vertical scale representing reliability. The organization presents the chart as a practical guide for consumers, educators, researchers, and advertisers seeking to understand the character and quality of media sources. The organization grew out of a blog called All Generalizations Are False, written by Denver-area patent attorney Vanessa Otero. Otero initially created the Media Bias Chart as a graphic intended to help people distinguish between fact reporting, analysis, opinion, and highly partisan or unreliable material. The chart attracted substantial attention after being shared on Imgur in December 2016. Ad Fontes Media was subsequently founded in 2018 as the publisher and institutional home for the project. Its name comes from the Latin phrase meaning “to the sources,” reflecting the stated intention to evaluate media by examining the content produced by each source rather than relying only on reputation or audience assumptions. Ad Fontes describes its approach as nonpartisan and seeks to balance the perspectives of its analysts. Its methodology uses reviewers who identify as politically left-leaning, right-leaning, or centrist. Analysts assess content across multiple dimensions of political bias and reliability, and their ratings are combined after discussion of significant disagreements. The organization has described its analyst pool as including people with at least bachelor’s degrees, with many holding graduate qualifications, and it provides training before analysts contribute to the ratings database. The methodology has evolved from Otero’s original individual judgments into a larger, structured review process involving articles, television programs, podcasts, and other media formats. Ad Fontes has positioned the chart as an “anchor” against political polarization and has expressed an ambition to become a kind of Consumer Reports for media ratings. Its commercial and institutional relevance extends beyond individual media consumers. The company markets media analysis and source-level rankings to advertisers and other organizations concerned with brand safety, misinformation, hate speech, and the environments in which advertising may appear. The Media Bias Chart has also attracted sustained criticism. Researchers and journalism commentators have questioned whether a limited sample of stories can represent the output of a large news organization, whether political bias and reliability can be measured objectively, and whether placing left- and right-wing sources on a symmetrical scale creates a misleading equivalence. Critics have argued that the chart may elevate a presumed political center as neutral or simplify complex differences among news organizations. Ad Fontes and Otero have defended the chart as a transparent, useful framework while acknowledging that it is not a complete or definitive measure of media quality. By 2024, reference materials described the project as having expanded its coverage to thousands of news sources, hundreds of podcasts, and hundreds of television or video programs. The organization remained active as a media-rating and research business. In 2025, the Federal Trade Commission sent civil investigative demand letters to several media-rating firms, including Ad Fontes Media, seeking information about operations, finances, methodologies, and industry relationships. CEO Vanessa Otero criticized the demands as excessive and overzealous but said the organization would cooperate.

Ad Fontes Media originated with Vanessa Otero’s blog, All Generalizations Are False. Otero, a patent attorney in Colorado, developed an early version of the Media Bias Chart to make differences in political orientation and information quality easier for readers to visualize. Her underlying concern was that many organizations described as news sources publish substantial amounts of commentary, analysis, or partisan material, while highly ideological outlets can intensify fear, tribalism, and confirmation bias. The chart gained widespread online attention after it was posted and shared through Imgur in December 2016. Its central design placed media sources along two axes: political bias from left to right and reliability from low to high. The visual model generally formed an inverted-U pattern, with sources near the political center tending to receive higher reliability scores and highly partisan sources tending to receive lower scores. The chart’s simplicity helped it circulate widely, but that same simplicity later became a central point of criticism. Otero founded Ad Fontes Media in 2018 to give the chart a formal organizational structure and to support its continued development. The name “Ad Fontes” refers to the Latin expression for going to the sources. The organization’s stated method was to assess the content produced by media outlets rather than classify them solely according to public reputation, ownership, or audience identity. A 2018 crowdfunding effort supported technical improvements, a larger analyst base, and greater transparency around the rating process. The methodology subsequently moved beyond Otero’s original assessments. Ad Fontes developed a panel-based system in which analysts with left-leaning, right-leaning, and centrist political identities review selected media content. Analysts receive training and assess material using multiple categories of bias and reliability. Scores are combined, and major differences may be discussed before final ratings are established. The organization has used this process to rate written articles, television and video programming, podcasts, and other forms of news-related content. The Media Bias Chart became Ad Fontes Media’s principal public-facing product and also supported a broader commercial model. The company offered media ratings and analytical information to advertisers seeking to evaluate the brand-safety qualities of news environments. Its work has also been used by educators, libraries, researchers, and members of the public as an introductory framework for comparing media sources. The chart’s reception has been mixed. Supporters have viewed the structured panel system as a useful operational approach to a difficult subject and have valued its effort to include analysts from across the political spectrum. Critics have argued that no rating system can objectively measure political bias or reliability, that a small sample of stories may not represent an entire outlet, and that a single left-to-right axis can flatten important differences in ideology, reporting practices, and institutional standards. A 2018 Columbia Journalism Review discussion questioned the thoroughness of media-bias charts based on relatively small samples. In 2021, a library and media-literacy critique argued that Ad Fontes could encourage false equivalence between left and right and treat a political center as inherently unbiased. Research commentary has also acknowledged that the system can provide a workable way to operationalize media selection while remaining limited as a measure of objective truth. The chart has drawn criticism from both sides of the political spectrum. Otero has described reactions in which people on the left accuse the organization of serving establishment or neoliberal interests, while people on the right accuse it of being left-wing. InfoWars founder Alex Jones criticized the chart after his outlet received an extremely unfavorable classification, and InfoWars published a counter-chart that presented itself positively while assigning negative labels to established news organizations. Ad Fontes continued updating and expanding its database. By spring 2024, reference material associated with Harvard Library described the organization as having assessed approximately 3,600 news sources, 700 podcasts, and 474 television or video programs, while also noting continuing debate about the credibility and interpretation of the ratings. In June 2025, the FTC included Ad Fontes among media-rating firms receiving civil investigative demands as part of broader scrutiny of companies that evaluate misinformation, hate speech, and deceptive content. The organization remained active and stated that it would cooperate with the inquiry.

• 2025

  FTC investigation into media-rating firms

  [1]Ad Fontes Mediaen.wikipedia.org

  The Federal Trade Commission issued civil investigative demands to Ad Fontes and other rating firms concerning their operations, finances, methods, and industry relationships.

• 2024

  Coverage expands across media formats

  [1]Ad Fontes Mediaen.wikipedia.org

  Reference material described the database as covering thousands of news sources, hundreds of podcasts, and hundreds of television or video programs.

• 2023

  Founder publishes an account of the organization’s mission

  [1]Ad Fontes Mediaen.wikipedia.org

  Vanessa Otero published a Poynter opinion piece describing why she created a system for rating news media.

• 2021

  Methodology and media-literacy debate intensifies

  [1]Ad Fontes Mediaen.wikipedia.org

  Academic and library commentators publicly debated whether the chart’s categories and presentation help or hinder media-literacy education.

• 2020

  Large-scale Media Bias Chart rating project

  [1]Ad Fontes Mediaen.wikipedia.org

  During a 2020 project, approximately 1,800 articles and television news programs were reviewed by a politically diverse analyst panel, producing thousands of individual ratings.

• 2018

  Ad Fontes Media is founded

  [1]Ad Fontes Mediaen.wikipedia.org

  Vanessa Otero established Ad Fontes Media to publish and develop the Media Bias Chart as an organized media-rating project.

• 2018

  Crowdfunding supports methodological and technical expansion

  [1]Ad Fontes Mediaen.wikipedia.org

  A crowdfunding campaign funded improvements to the chart’s technology, a larger analyst network, and clearer methodology documentation.

• 2016

  Media Bias Chart gains viral attention

  [1]Ad Fontes Mediaen.wikipedia.org

  Vanessa Otero’s early Media Bias Chart circulated widely on Imgur, bringing the project significant public attention.

A nonpartisan, methodology-driven media intelligence and media-literacy organization that helps audiences and advertisers assess political bias, reliability, and brand-safety characteristics across news and information sources.

• Media rating and visualization · 2016

  Media Bias Chart

  Ad Fontes Media’s flagship visual product maps news and information sources according to political bias and reliability. The chart is designed to provide a quick comparative overview rather than a complete judgment of any publication or program. Its ratings are based on reviews of selected content and are intended to help users distinguish among relatively factual reporting, commentary, highly partisan material, and unreliable or propagandistic content. The chart has been expanded over time to include written news, television and video programs, podcasts, and other media formats.

• Media intelligence · 2018

  Media source and content ratings

  Ad Fontes produces structured ratings and underlying analysis for media sources and individual pieces of content. Analysts assess material across several categories of political bias and reliability, with scores combined across reviewers representing different political perspectives. These data support the public chart and can also be used by researchers, educators, advertisers, and organizations evaluating information quality and media environments.

• Advertising and media analysis

  Brand-safety media analysis

  Ad Fontes markets its media evaluations to advertisers and organizations that need contextual information about news environments. The offering is intended to help users assess the risks and characteristics associated with placing advertising near content involving misinformation, extreme partisan framing, hate speech, or other potentially unsuitable material. The available reference material does not specify a separate product name or pricing structure.

• 2018Media Bias Chart crowdfunding campaign

  United States

  Ad Fontes conducted a crowdfunding campaign to improve the technical infrastructure behind the Media Bias Chart, increase the number of analysts involved in ratings, and make the methodology more transparent.

  Outcome. The campaign supported the transition toward a larger and more formally documented rating operation.

  Source

• 2025

  Cooperate with the FTC media-rating inquiryOther

  Background

  The FTC issued civil investigative demand letters to several media-rating firms, requesting information about their operations, finances, methodologies, and relationships within the industry.

  Action taken

  Although CEO Vanessa Otero characterized the demands as excessive and overzealous, Ad Fontes stated that it would cooperate with the investigation.

  Aftermath

  The inquiry placed additional regulatory attention on the role and business practices of media-rating organizations.

  Source

• 2018

  Formalize the Media Bias Chart as an organizationStrategy

  Background

  The chart had originated as Vanessa Otero’s blog project and gained broad attention online.

  Action taken

  Otero founded Ad Fontes Media as the organization responsible for publishing and developing the chart.

  Aftermath

  The project gained an institutional structure and expanded toward analyst-based ratings, research, and commercial media intelligence.

  Source

• 2018

  Adopt a multi-analyst, politically balanced rating approachStrategy

  Background

  The original chart relied primarily on Otero’s individual judgments, prompting questions about subjectivity and consistency.

  Action taken

  Ad Fontes developed a process using analysts who identify as left-leaning, right-leaning, or centrist, with training and structured scoring across bias and reliability dimensions.

  Aftermath

  The methodology became more systematic and transparent, although researchers continued to debate whether political bias and reliability can be measured objectively.

  Source

1. 1Ad Fontes Mediaen.wikipedia.org
2. 2Ad Fontes Media official websiteadfontesmedia.com