Evaluating Source Credibility
Source credibility can be evaluated in two ways: media reliability and factual accuracy.
Two tools that make this easier are the Ad Fontes Media Bias Chart and Media Bias/Fact Check (MBFC).
Ad Fontes
Media reliability means how dependable a news source is when reporting facts. Reliable sources focus on clear, accurate information rather than opinion or unsupported claims.
The Ad Fontes Media Bias Chart shows both reliability and political bias.
Sources near the top report facts carefully and use solid evidence.
Sources near the bottom rely more on opinions or weaker information.
Sources in the center are usually balanced, while those far to the left or right show stronger political leanings.
The most trustworthy sources are found near the top and center of the chart. They combine accurate reporting with little to no bias.
Examples: USAFacts, Pew Research Center, Reuters, and the Associated Press
MBFC
Factual accuracy means how truthful and careful a source is when sharing information. Reliable sources clearly separate facts from opinions and use trustworthy evidence.
You can check how accurate a source is by using Media Bias/Fact Check (MBFC). MBFC rates thousands of outlets and explains their bias, accuracy, and transparency.
For example, AP News is rated least biased and very high in factual reporting. To check a source, go to https://mediabiasfactcheck.com and search for its name. Each profile explains why the source got that rating and gives examples of reliable or unreliable reporting.
Using Ad Fontes and MBFC
When you're not sure about a source, check Ad Fontes to see if it’s high and centered on the chart. Then, use MBFC to confirm that it’s rated high or very high in factual accuracy.
Be cautious with sources that exaggerate stories, use emotional or misleading headlines, or leave out important facts. Always look for confirmation from multiple trusted outlets before accepting a claim as true.