Misinformation vs disinformation vs bias — what's the actual difference?

Three words you've probably heard a hundred times this year, often used as if they're synonyms. They're not. The differences matter — both legally and practically.

Misinformation

False or inaccurate information, spread without intent to deceive. The person sharing it believes it's true.

Example: someone shares an old photo from a different protest, thinking it's from yesterday's protest. The photo is real; the attribution is wrong; the sharer isn't lying — they're mistaken.

Most "misinformation" online is misinformation in this strict sense. People share things that flatter their priors without checking.

Disinformation

False or misleading information, deliberately created and spread to deceive. The originator knows it's false (or doesn't care).

Example: a coordinated campaign to make a fake document appear to be a leaked memo from a political opponent. The originator knows the document is fake. The downstream sharers might not — they're spreading disinformation that has become their misinformation.

Disinformation is much rarer than misinformation, but more damaging. It's also more legally actionable when it crosses into defamation.

Bias

A consistent pattern of framing, selection, or omission that tilts a reader toward one interpretation over another. The underlying facts can be entirely true.

Example: two outlets cover the same protest. One outlet leads with the speech; the other leads with the property damage. Both are accurate. Both are biased — by selection.

Bias is universal. There is no unbiased outlet. The honest goal isn't elimination but transparency: knowing the lean of each source you read so you can triangulate. Outlet Trust Leaderboard provides the lean data.

Why the difference matters

- For readers: knowing whether you're dealing with misinformation, disinformation, or bias tells you what to do about it. Misinformation calls for a correction. Disinformation calls for source-blocking. Bias calls for cross-reading. - For platforms: moderation policies differ wildly across the three. Platforms typically remove disinformation, label misinformation, and leave bias alone (it's protected speech). - For accountability: defamation law cares deeply about intent. Bias is almost never legally actionable. Disinformation can be.

A practical rule of thumb

When you see a claim that's clearly false: ask yourself whether the originator probably knew. If yes, disinformation. If no, misinformation. If the claim isn't technically false but is shaped to push one interpretation: that's bias.

Prism Source Receipts gives you per-claim verdicts (VERIFIED / CHERRY-PICKED / OUT-OF-CONTEXT / MISATTRIBUTED / UNVERIFIABLE) — those map closely to this taxonomy and let you separate signal from noise in seconds.

Related: What is media bias · How to fact-check a news article.