Ad Fontes Media, Inc. is a Colorado-based media watchdog organization primarily known for its Media Bias Chart, which rates media sources in terms of political bias and reliability. The organization was founded in 2018 by patent attorney Vanessa Otero with the goal of combating political polarization and media bias. Ad Fontes Media uses a panel of analysts across the political spectrum to evaluate articles for the Chart. Ad Fontes Media has its origins in a blog called All Generalizations are False which was written by patent attorney Vanessa Otero from Denver, Colorado. Otero first published the Media Bias Chart, a graphic which helped viewers visualize media bias in the United States, on the blog. The Media Bias Chart became a viral phenomenon on the Imgur image sharing service in December 2016, and Otero founded Ad Fontes Media to serve as the publisher of the chart. One of Otero's reasons for creating the organization was that "many sources people consider to be 'news sources' are actually dominated by analysis and opinion pieces," and that "extreme sources play on people's worst instincts, like fear and tribalism, and take advantage of people's confirmation biases." In an interview with Newsy, she stated that "If people understood that the sources they are consuming are actively making them angrier and polarizing them, then they might choose to consume less of that." More information...
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The website is placed before companydatabase.org and after allbasketball.org in the BestRef global ranking of the most important sources of Wikipedia.