Lateral reading is a skill used by professional fact-checkers to jump outside of a source and use new browser tabs to seek additional information about a source's credibility, reputation, funding sources, and biases.
AllSides is an American company that assesses political bias of prominent media outlets, and presents different versions of similar news stories from sources of the political right, left, and center, in a mission to show readers news outside their filter bubble.
Media Bias/Fact Check is an American fact-checking website that uses a 0–10 scale to rate sites for biased wording, headlines, actuality, sourcing, story choices, and political affiliation. This site also gives each publication a rating for factual reporting.
A nonpartisan, nonprofit “consumer advocate” for voters that aims to reduce the level of deception and confusion in U.S. politics. FactCheck.org monitors the factual accuracy of what is said by major U.S. political players in the form of TV ads, debates, speeches, interviews and news releases.