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How to Tell Whether Information Online Is Reliable

The internet is a publishing channel, not a guarantee of accuracy. Check the source, follow its evidence, and look for genuinely independent confirmation before relying on important claims.
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Trust an online claim only after checking who made it, what evidence supports it, and whether other sources confirmed it independently. The internet is a publishing channel, not a quality filter: a claim does not become reliable just because it appears on a polished site or is repeated across many pages.

Why the internet itself cannot be rated as trustworthy or untrustworthy

Online publishing includes established publishers, specialists, organizations, and individual contributors. The ease of publishing means useful and accurate material sits alongside unsupported or mistaken claims. Reliability therefore depends on the particular claim and its source, not on the fact that it is online.

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Leo A. Notenboom made this point in an Ask Leo! article originally posted in 2012 and updated on March 21, 2020. His practical advice is to assess each source, trace important claims to evidence, and build a provisional list of sources that have held up to scrutiny. The article is a useful framework, not a guarantee that any named site or familiar source is accurate today. Read the Ask Leo! article.

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How to check a claim before relying on it

  1. Identify the exact claim. Separate a specific, checkable statement from opinion, prediction, or a broad summary. Note any dates, definitions, location, or technical conditions that could change what the statement means.
  2. Inspect the source. Look for who wrote or published the material, what relevant expertise or access they have, when it was published or updated, and whether it explains its evidence. A professional appearance or familiar name is not proof.
  3. Follow the references. Open the cited study, documentation, dataset, or original report where possible. Check whether it actually supports the claim and whether the writer has represented its scope and qualifications accurately.
  4. Seek independent confirmation. Compare sources that did their own reporting or analysis. Several pages that cite, quote, or reword the same original source are not several independent confirmations.
  5. Match confidence to consequence. For a low-stakes question, a credible source may be enough to guide further learning. Before acting on a consequential claim or sharing it as fact, seek stronger evidence and independent confirmation. If you cannot check an important claim, leave it unconfirmed rather than presenting it as established.

Why repeated claims can still be wrong

Online repetition can create the appearance of consensus even when many pages trace back to one source. A mistaken statement may be copied, summarized, or reposted until the original evidence is hard to see. Count independent origins, not search results or matching headlines.

Check the citation trail: do the sources point to distinct evidence, or do they all refer to the same article, post, or document? If the trail ends at one unsupported assertion, repetition has not strengthened it.

How to approach common online sources

Wikipedia

Wikipedia can be a useful starting point, especially when its references point to relevant primary or authoritative material. Treat the entry as a map to sources rather than final proof. Quality varies, and entries on obscure or controversial subjects may be less dependable. Also check whether another site has simply republished Wikipedia content; that is not independent confirmation.

Fact-checking sites

A fact-check can help explain a disputed claim, but no fact-checking organization should be treated as infallible. Prefer checks that identify their evidence and reasoning, then inspect those sources yourself. For an important or contested claim, compare independent checks rather than relying on one verdict alone. Notenboom’s 2020 article named Snopes as one possible resource; treat that as a dated example, not an endorsement or a claim about its current coverage.

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Technical information

For a computer-science question such as how IP addresses work, use online material as you would any technical reference: check the author’s basis, follow cited documentation, and compare independent explanations. Verify that a page addresses the same protocol, version, or context as your question. The fact that a topic is technical does not make web material automatically more or less dependable than a book.

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Keep trusted sources provisional

It is practical to remember sources that have repeatedly provided traceable, well-supported information. Treat them as more trusted, not absolutely trusted. Check the particular claim and its context each time, including when it agrees with what you already believe. Skepticism is most useful when it applies consistently, rather than only to claims that feel unfamiliar or unwelcome.

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What the original article can and cannot establish

The Ask Leo! page is practical editorial guidance, not a quantified study of online accuracy; it provides no statistics that establish how often internet claims are true. Its update date is March 21, 2020, and the publisher’s archive lists it in 2020 as well: Ask Leo! 2020 archive. Use the method rather than assuming the dated examples describe every source or platform as it works now.

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