Lateral reading is a strategy for evaluating online information by leaving the page you’re on and opening new browser tabs to check what outside sources say about the author, publisher, or claims. Instead of judging a website by how it looks or what it says about itself, you step away and verify it from the outside. The concept was developed by researchers at Stanford University who studied how professional fact-checkers evaluate digital information, and it has since become a core skill in media literacy education.
How Lateral Reading Works
The process has four basic steps. First, notice your emotional response to what you’re reading. If a headline makes you angry, anxious, or excited, or if you’ve landed on an unfamiliar source, that’s your cue to pause and investigate rather than keep scrolling or sharing. Strong emotional reactions are a signal, not a reason to trust the content more.
Second, leave the original source. This is the defining move. Instead of staying on the page and reading more carefully, open a new browser tab. In that new tab, search for the name of the author or the organization behind the content. Adding the word “credibility” to your search terms often surfaces useful results quickly. Third, look at what independent sources say. Wikipedia, established news outlets, and fact-checking sites like Snopes, PolitiFact, and FactCheck.org can all help you understand who is behind the information and what their track record looks like.
Finally, take what you’ve learned and apply it back to the original source. If the author has relevant expertise and the organization has a solid reputation, you can read more confidently. If outside sources raise red flags, you know to treat the claims with skepticism or look for better sources entirely.
Why Vertical Reading Falls Short
Most people evaluate websites the way they were taught in school: stay on the page, check if it looks professional, read the whole article, review the citations, and visit the “About” page. This is called vertical reading, and it feels thorough. The problem is that it relies almost entirely on information the site provides about itself.
An “About” page is written to present the organization favorably. A sleek design with clean typography and professional stock photos costs very little to produce. Citations can look impressive without actually supporting the claims being made. Even extremely professional-looking websites can contain misinformation. Vertical reading asks you to judge a source using only the evidence that source has chosen to show you, which is a bit like evaluating a job candidate based solely on their own cover letter.
Lateral reading bypasses this trap by seeking independent verification. You’re no longer relying on the site to tell you it’s trustworthy. You’re checking whether anyone else agrees.
The Stanford Study That Started It All
The term “lateral reading” comes from a Stanford University study that compared how three groups evaluated online information: 10 professional fact-checkers, 10 PhD historians, and 25 Stanford undergraduates. The results were striking.
In one task, participants assessed two websites about bullying, one from the American Academy of Pediatrics (a mainstream medical organization) and one from the American College of Pediatricians (a small advocacy group with positions outside the medical mainstream). The fact-checkers quickly identified the difference by leaving the sites and checking each group’s reputation elsewhere. The historians largely concluded both sites were reliable. The students overwhelmingly rated the advocacy group’s site as more trustworthy, likely because it looked more polished.
In another task, participants had to figure out who funded the legal fees in a real education lawsuit. Again, fact-checkers found the answer faster and more accurately. The key difference wasn’t that they were smarter or knew more about the topics. They simply used a different strategy: they spent less time on the original source and more time checking it against outside information. They read laterally.
Lateral Reading in Practice
You don’t need to be a professional fact-checker to use this approach. The core habit is simple: before you trust or share something, open a new tab and spend 30 seconds finding out who created it. A few practical techniques help.
Search the organization’s name on Wikipedia. The entry (or absence of one) often tells you quickly whether a group is a major institution, a small advocacy organization, or something in between. Look for coverage in established news outlets. If a health claim comes from an organization that no major medical or news source has ever mentioned, that’s worth noting. For specific factual claims, fact-checking sites like Snopes, PolitiFact, AP Fact Check, and Reuters Fact Check maintain searchable databases of verified and debunked stories.
A related framework called SIFT, developed by digital literacy researcher Mike Caulfield, organizes the process into four moves: Stop, Investigate the source, Find better coverage, and Trace claims to the original context. It’s essentially lateral reading packaged as a memorable checklist, and many universities now teach it alongside or instead of older source-evaluation methods.
Why It Matters Now
Traditional media literacy education focused on a checklist approach: Does the site end in .org? Does it list an author? Are there citations? These criteria made more sense when publishing online was expensive and relatively rare. Today, anyone can build a professional-looking website in an afternoon. Domain names, design templates, and even fabricated citations are easy to produce. The surface-level cues that once signaled credibility are no longer reliable on their own.
Lateral reading shifts the question from “Does this site look credible?” to “What do independent, knowledgeable sources say about this site?” That single shift in habit, leaving the page before deciding whether to trust it, is what separated expert fact-checkers from historians and students in the Stanford research. It’s a skill that takes minutes to learn and seconds to apply, and it fundamentally changes how you interact with information online.