Lateral Reading: How Fact-Checkers Verify Online Information

In 2016, a team of researchers at Stanford led by historian Sam Wineburg gave an online-information test to three groups: professional fact-checkers, professional historians, and Stanford undergraduates. The results surprised everyone. The fact-checkers blew the other two groups away — and their secret was not more knowledge. It was a different way of reading.

When the historians and students evaluated an unfamiliar website, they read it vertically. They stayed on the page, scrolled through it, judged its design, its tone, and its claims. They treated the website itself as the thing to evaluate. The fact-checkers did the opposite. The moment they landed on an unfamiliar site, they left it. They opened new tabs and searched for the organization behind the site, the people funding it, and what other sources said about it. Only after checking the site from the outside did they return to judge its content. This strategy is called lateral reading, and it is the single most powerful verification skill ever documented in education research.

Lateral reading matters because the internet rewards the opposite instinct. Online, anyone can publish anything with a professional-looking design. A website that looks official may be run by a lobbyist, a foreign influence operation, or an AI generating content at scale. Reading vertically is like judging a book by its cover while refusing to check who wrote it. Reading laterally is like asking a librarian about the author before you decide to trust the book.

The method is simple enough to teach in one class period. When you encounter an unfamiliar source, do not argue with it. Do not judge its design. Instead: open a new tab. Search for the name of the organization or author. Look for what reliable, established sources say about them. Ask three questions: Who is behind this information? What is their goal? What do other credible sources say about them? If the organization turns out to be a front group, or the author has no track record, you have your answer — and you never had to analyze a single argument on the page.

This is not a partisan skill. Fact-checkers on every side of the political spectrum use lateral reading, because it works. It is a tool of intellectual independence: it lets citizens evaluate information on their own instead of relying on an algorithm or an influencer to tell them what to trust.

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