How to Tell If a Source Is Reliable
By Christopher Elley, Founder, FactHeck · Last reviewed 28 May 2026
Written with AI assistance and reviewed for accuracy by the author.
Telling if a source is reliable takes a minute of lateral reading. Before you read the article itself, open a new tab and search the publication name to find out what others say about it. Wikipedia, AllSides, and MediaBiasFactCheck each maintain non-partisan assessments of major outlets. Then check the author: search their name to see whether they write for multiple credible outlets and have a verifiable professional background. Look at the domain: .gov.uk, .ac.uk, and established press domains carry higher baseline credibility than unfamiliar .info or .net sites. Check the date of publication, as older articles may no longer reflect current evidence. Finally, ask whether the article cites its own primary sources (studies, official statistics, named officials). A reliable source makes it easy to verify its claims independently; an unreliable one makes it hard.
Why source evaluation matters more than ever
The volume of content published online every day vastly outpaces editorial filtering. Search engines and AI chatbots surface low-credibility sources alongside authoritative ones, often with equal visual weight. Meanwhile, trust in news media has been declining: the Reuters Institute Digital News Report tracks falling confidence in news outlets across most surveyed countries, and Ofcom's News Consumption in the UK research shows that a significant share of UK adults regularly encounter news on social media, platforms with no editorial gate. In that environment, the ability to evaluate a source for yourself is a practical necessity, not an optional skill.
The SIFT method: a four-step framework
SIFT is a concise framework developed by digital literacy educator Mike Caulfield and described in his open guide “SIFT (Four Moves)”. It has since been adopted by Wikipedia's literacy resources, ISTE, and numerous UK universities as a practical starting point for source evaluation.
| Step | Question to ask | Tool to use |
|---|---|---|
| S: Stop | Am I reacting emotionally before I've checked anything? | Pause; take a breath |
| I: Investigate the source | What do others say about this outlet or author? | Wikipedia, MediaBiasFactCheck, AllSides |
| F: Find better coverage | Has a more credible outlet reported the same story? | Google News, Reuters, BBC |
| T: Trace claims | Does the article link to a primary source, and does that source say what's claimed? | ONS, Google Scholar, official reports |
Lateral reading: what it is and why it works
Lateral reading means reading about a source from outside that source, rather than through its own “About” page. Instead of scrolling to the bottom of the article to find a self-written description of the outlet's editorial values, you open a new tab and search the outlet name alongside words like “reliability” or “Wikipedia”.
Research by the Stanford History Education Group found that professional fact-checkers and journalists almost universally used this technique, whereas students and members of the public tended to read vertically, scrolling through the page looking for internal signals of credibility, which are easy to fabricate. Lateral reading surfaces third-party assessments that are far harder to fake.
Useful starting points: AllSides (political bias ratings for major outlets), MediaBiasFactCheck (international outlet assessments), and Wikipedia's article on the publication.
Domain and URL red flags
The domain name is a quick first signal, not definitive, but worth checking:
- .gov.uk: UK government sources; reliable for official statistics and policy (check the owning department)
- .ac.uk: UK university and research institution sites; peer-reviewed research context
- Established UK press: BBC, The Guardian, The Times, Financial Times, Reuters, PA Media; editorial standards are publicly documented
- Warning signs: domains that mimic real outlets (e.g.
abcnews.com.co), or unfamiliar.info,.xyz,.netdomains making news claims - Parody sites: The Onion (US) and The Daily Mash (UK) are satirical; both are sometimes shared without that context
Author verification
Search the author's name and ask: do they appear across multiple credible outlets? Is their claimed background verifiable through a LinkedIn profile, an institutional page, or a body of published work? Anonymous or pseudonymous authorship on factual claims is a warning sign. The IFCN Code of Principles, which governs accredited fact-checkers worldwide, places transparency of authorship as a core requirement, for good reason.
Publication date and currency
Old articles are frequently re-shared as if they are current. Check the date before the first paragraph. Some publishing platforms hide it or display a “last updated” date that may be unrelated to the substance of the article.
For science or health claims, check whether the study being cited has been superseded or retracted. Retraction Watch maintains a searchable database of retracted academic papers.
Tracing claims back to primary sources
Reliable articles link to or name a primary source: an official report, a dataset, a study, a named official's statement. Click through and check: does the primary source actually say what the article claims? A common failure mode is the phrase “a study found X”. Find the actual study, check the sample size, the methodology, and whether it was peer-reviewed before you accept the summary.
For UK figures, the Office for National Statistics (ONS) is the authoritative source for official UK data. If a claim quotes a UK statistic, cross-reference it against ONS before sharing.
Evaluating social media as a source
Social media posts (tweets, TikToks, Facebook posts) are not primary sources. They require exactly the same checks as any other claim. A verified tick on an account confirms identity, not accuracy. Screenshots of posts are particularly risky: they can be fabricated, so always try to find the original post on the platform before treating a screenshot as evidence.
Quick-reference reliability signals
| Source type | Typical reliability | How to verify |
|---|---|---|
| .gov.uk (government) | High for official policy and statistics | Check owning department; cross-reference ONS |
| .ac.uk (university) | High for peer-reviewed research | Find the original study via Google Scholar |
| Major UK press (BBC, Guardian, FT, Times) | Generally high; check byline and date | IPSO/IMPRESS membership; OFCOM for broadcasters |
| Specialist magazines / trade press | Variable: good within field, weaker outside it | Author credentials; primary source links |
| Blogs and independent websites | Highly variable | Full lateral reading; author search; citations present? |
| Social media posts | Not a primary source | Find original; check account history; run SIFT |
| AI chatbot output | Low without citations; can hallucinate | Verify every factual claim against a primary source |
Tools for source checking
- AllSides: political bias ratings for major US and some international media
- MediaBiasFactCheck: international outlet assessments, including UK publications
- Retraction Watch: searchable database of retracted academic papers
- Google Scholar: find and verify original academic papers
- ONS: Office for National Statistics; authoritative UK data
- Full Fact: UK's leading independent fact-checker; source guides and previous verdicts
Frequently asked questions
What is lateral reading and why does it work?
Lateral reading means searching for what others say about a source rather than relying on the source's own “About” page. Research by the Stanford History Education Group found that professional fact-checkers use this technique instinctively because third-party assessments are far harder to fabricate than self-descriptions. Search the outlet name alongside “Wikipedia” or “reliability” before reading the article itself.
Is a .gov.uk website always reliable?
Government websites are reliable for official statistics, policy documents, and legislation, but you should still check which department owns the page and when it was last updated. Official figures can be out of date, and some pages reflect policy positions that are under review. Always cross-reference numerical claims against the ONS or the relevant department's original release.
How do I check whether an author is credible?
Search the author's name and ask whether they appear across multiple credible outlets, whether their professional background is verifiable through LinkedIn or an institutional page, and whether they have a body of published work in the relevant field. Anonymous authorship on factual claims is a warning sign. The IFCN Code of Principles treats transparency of authorship as a core requirement for accredited fact-checkers.
Can I trust a source that lots of people have shared?
No. Share count is not a measure of accuracy. Research on misinformation spread shows that false content is often shared faster than true content because it tends to be more emotionally engaging. A high share count tells you that a piece is viral; it tells you nothing about whether the underlying claim is correct. Run the SIFT checks regardless of how widely something has been shared.
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