Source Evaluation
Evaluating Online Sources
Build a systematic toolkit for judging whether an online source deserves your trust, practicing the same checklist professional fact-checkers use every day. These skills will help you quickly separate credible health advice, news reports, and research claims from misleading content you encounter on social media, search results, and shared links.
Context
Why this exercise
Almost every claim you encounter online — about your health, your investments, the world, your community — arrives mediated by a source you cannot verify directly. The skill of source evaluation is the skill of deciding how much trust a given source has earned before you incorporate its claims into your beliefs or pass them along to others. This exercise builds the same lateral-reading checklist that professional fact-checkers use, drilled on realistic scenarios drawn from health misinformation, financial advice, breaking-news rumors, and academic-sounding pieces that turn out to be advocacy.
Before you start
Source evaluation is the foundational skill of digital literacy: before you can reason about a claim, you need a calibrated sense of how much weight to give the evidence behind it. Professional fact-checkers do not evaluate sources by reading the page top-to-bottom and looking for red flags. Instead, they use a practice called lateral reading — they leave the page almost immediately to see what independent, high-quality outlets say about the source itself. This is more accurate than in-page signals because attractive design, authoritative-sounding language, and .org domain names are cheap to fake.
This exercise builds a checklist you can run on any online source in under a minute: (1) Who is the author or organization, and what is their track record? (2) What is the original source of the specific claim — is it a primary document, a peer-reviewed study, or a chain of summaries? (3) Does the piece distinguish between evidence and interpretation, or blur them together? (4) Are the cited experts actually qualified on the specific claim, or just generally prominent? (5) Is the evidence presented in context, or cherry-picked? A source does not have to ace every question to be useful, but the more it fails, the more corroboration you need from elsewhere.
A common mistake is treating source evaluation as binary — trustworthy or not. In reality, the same outlet can be rigorous on one topic and sloppy on another, and the same expert can be reliable within their field and unreliable outside it. Aim for calibrated skepticism: update on the specific claim and the specific evidence, not on the brand. The Media Literacy lesson covers the broader skill set, including how to spot framing effects, engagement-driven misinformation, and the patterns of manipulation that show up consistently across platforms.