Spreading false information online is not, by itself, a crime in the United States. The laws that govern online disinformation attach consequences only when a falsehood is deliberate and tied to a specific harm the legal system already recognizes: a suppressed vote, a defrauded investor, a damaged reputation, a nonconsensual intimate image. Within those categories, the penalties are serious and include federal prison time, civil damages running into the millions, and SEC enforcement actions. Outside them, most false speech online is constitutionally protected, and the platform hosting it is almost never the party on the hook.
Why Intent Is the Hinge
The legal system distinguishes disinformation from ordinary error by looking at the speaker’s state of mind. Disinformation is false content created and spread with the deliberate purpose of deceiving. Misinformation is false content shared by someone who believes it. Someone forwarding a debunked health claim in good faith is spreading misinformation. Someone fabricating that claim to influence behavior is spreading disinformation.
Lawyers call the mental-state element “scienter.” For most legal consequences to attach, the person pursuing the case has to show the speaker knew the content was false when they published it, or at minimum acted with reckless disregard for whether it was true. That usually requires evidence like internal messages, prior corrections the speaker ignored, or a pattern of fabrication. Honest error is a defense almost everywhere the law touches false speech.
This is the reason most online falsehoods never produce a case. The volume is enormous; the share that meets the intent threshold is small. Prosecutors and plaintiffs also have to show the falsehood produced a legally recognized harm, which narrows the field further.
What the First Amendment Protects
Any government rule that restricts speech based on its content faces strict scrutiny, the hardest constitutional test to pass. The government must show the restriction serves a compelling interest and uses the least restrictive means available.1Legal Information Institute. U.S. Constitution Annotated – Content Based Regulation Most proposed general bans on online disinformation can’t clear it.
The Supreme Court made the point directly in United States v. Alvarez (2012), holding that “falsity alone may not be enough to exclude speech from the protection of the First Amendment.”2United States Courts. Holding – U.S. v. Alvarez The case involved a man who lied about receiving the Medal of Honor; the Court struck down the federal statute criminalizing that lie because it swept up falsehoods without requiring a specific legally cognizable harm.
False speech loses protection when it falls into recognized categories: incitement to imminent lawless action, speech integral to criminal conduct, fighting words, child pornography, fraud, and speech presenting a grave and imminent threat the government can prevent.2United States Courts. Holding – U.S. v. Alvarez A conspiracy theory, without a specific call to imminent violence, usually doesn’t fit any of those boxes.
For incitement, the Brandenburg v. Ohio test requires that the speech be both directed at inciting imminent lawless action and likely to produce it.3Legal Information Institute. Brandenburg Test A post urging people to storm a specific building tomorrow meets that bar. Most political disinformation does not. And in Counterman v. Colorado (2023), the Court held that even for unprotected categories like true threats, the government must prove the speaker had some subjective awareness of the threatening nature of the statement; recklessness is enough, negligence is not.4Supreme Court of the United States. Counterman v. Colorado
Who You Can Actually Sue: Section 230
When someone posts a damaging lie on a social media platform, the legal target is the person who wrote it, not the company that hosted it. Section 230 of the Communications Decency Act provides that interactive computer services cannot be treated as the publisher or speaker of content posted by their users.5Office of the Law Revision Counsel. 47 USC 230 – Protection for Private Blocking and Screening of Offensive Material
That immunity holds even when platforms moderate, label, or algorithmically recommend content. Courts have consistently ruled those editorial choices don’t make the platform a “creator” of the underlying post. Immunity breaks down only when the platform itself materially contributes to creating the unlawful content.
Section 230 has carve-outs. Federal criminal law is not blocked by it, so federal prosecutors can pursue platforms under criminal statutes where the facts fit. Intellectual property claims are excluded. And the Allow States and Victims to Fight Online Sex Trafficking Act (FOSTA-SESTA) removed immunity for conduct violating federal sex trafficking laws, opening platforms to civil claims under the Trafficking Victims Protection Act and to state criminal charges for trafficking-related conduct. Beyond those exceptions, the practical rule is the same one Congress wrote in 1996: liability runs to the speaker, not the host.
Federal Crimes That Cover Online Falsehoods
A handful of federal statutes reach online disinformation when it is tied to specific harms. Each requires proof of intent, and each carries real prison exposure.
Election Interference
Deliberately spreading false information about how, when, or where to vote can be charged as a conspiracy against rights under 18 U.S.C. § 241. The statute covers conspiracies to injure or prevent any person from freely exercising a constitutional right, including the right to vote, and carries up to 10 years in prison.6GovInfo. 18 USC 241 – Conspiracy Against Rights
In 2023, Douglass Mackey was convicted under § 241 for creating and distributing social media graphics during the 2016 presidential election that falsely told voters they could cast ballots by text message. He was sentenced to seven months in federal prison. The court made clear the statute reaches deceptive online speech intended to suppress votes, and that its intent requirement keeps accidental misinformation out of its scope.
Wire Fraud
When online falsehoods are part of a scheme to obtain money or property through deception, they can be charged as wire fraud under 18 U.S.C. § 1343. Penalties run up to 20 years in prison, rising to 30 years and a $1 million fine if the fraud affects a financial institution.7Office of the Law Revision Counsel. 18 USC 1343 – Fraud by Wire, Radio, or Television Fabricated news stories pushing donations to fake charities, phishing campaigns built around manufactured emergencies, and disinformation aimed at manipulating crowdfunding all sit inside the statute.
Undisclosed Foreign Influence
Individuals who conduct online influence campaigns on behalf of a foreign government or political entity must register under the Foreign Agents Registration Act. Willfully failing to register, or filing false registration information, carries up to $250,000 in fines and five years in prison; U.S. public officials acting as unregistered foreign agents face up to two years.8U.S. Department of Justice. FARA Enforcement FARA’s trigger is the undisclosed foreign relationship, not the truth or falsity of what is being posted. The content can be accurate and the violation still exists.
Nonconsensual Intimate Deepfakes
The TAKE IT DOWN Act, signed into law in May 2025, created the first federal criminal prohibition on publishing nonconsensual intimate images, including AI-generated deepfakes. Platforms must remove such content within 48 hours of notification by the person depicted, and anyone who publishes or threatens to publish these images faces imprisonment and mandatory restitution.9U.S. Congress. S.146 – TAKE IT DOWN Act A separate bill, the DEFIANCE Act, would add a private right of action with a $150,000 statutory damages floor. It passed the Senate in early 2026 but has not been signed into law.
Civil Lawsuits You Can Bring
Criminal cases depend on prosecutors. If you’ve been personally harmed by online falsehoods, your more direct option is a civil suit for damages.
Defamation
Defamation is the main vehicle. You have to prove the defendant published a false statement of fact about you to at least one other person, and that it caused real reputational or financial harm. Opinions, satire, and substantially true statements generally don’t support a claim.
Your burden depends on who you are. Public figures must prove “actual malice” under New York Times Co. v. Sullivan, meaning the speaker knew the statement was false or acted with reckless disregard for its truth.10Justia. New York Times Co. v. Sullivan, 376 U.S. 254 (1964) Private individuals have a lower bar: under Gertz v. Robert Welch, Inc. (1974), states may allow recovery on a lesser showing than actual malice, though not on strict liability. Most require at least negligence.
Damages can be substantial. Judgments in cases involving fabricated online content that destroyed business reputations or personal livelihoods have exceeded $1 million.
False Light and Emotional Distress
When the harm doesn’t fit defamation cleanly, two related claims may apply. False light reaches situations where someone presents information about you in a way that creates a highly offensive and misleading impression, even if no single statement is technically false; the focus is the overall impression rather than a specific false assertion.11Legal Information Institute. False Light Intentional infliction of emotional distress reaches disinformation campaigns so extreme and outrageous that they cause severe psychological harm. The threshold is high, but sustained harassment campaigns built around fabricated content, particularly those aimed at private individuals, can clear it.
Anti-SLAPP: A Risk If You’re the Plaintiff
Roughly 40 states plus the District of Columbia have anti-SLAPP laws, which let defendants in speech-related cases file an early motion to dismiss when the suit targets speech on a matter of public concern. If the plaintiff can’t show a reasonable probability of winning, the case is thrown out at the outset. In many states, the losing plaintiff then has to pay the defendant’s attorney fees.
These statutes cut both ways. They stop plaintiffs who file defamation suits to silence critics, and they also let people who spread genuinely harmful falsehoods delay or defeat real claims. Strength varies significantly by jurisdiction, and the fee-shifting risk is worth weighing before filing.
Securities Fraud and Market Manipulation
Falsehoods aimed at moving stock prices trigger a separate framework. SEC Rule 10b-5 prohibits false or misleading statements made in connection with the purchase or sale of securities, and social media is now a primary venue for these schemes. The pump-and-dump, where someone hypes a stock with fabricated claims and sells into the inflated price, works the same on a platform as it did on a phone, with a far wider reach.
The SEC has pursued these cases directly. In one action, the agency charged eight individuals in a $100 million stock manipulation operation conducted through social media platforms, seeking injunctions, disgorgement, and civil penalties.12U.S. Securities and Exchange Commission. SEC Charges Eight Social Media Influencers in $100 Million Stock Manipulation Scheme For licensed financial professionals, FINRA adds another layer, requiring that all communications with the public, including social media posts and mobile app notifications, be fair and balanced.13FINRA. 2026 FINRA Annual Regulatory Oversight Report – Communications with the Public
What It Costs to Pursue a Case
If you’re considering a civil case, the economics matter. Court filing fees for a civil complaint range from under $100 to over $1,000 depending on the state and the damages sought. Attorney hourly rates for defamation work typically run from roughly $180 to over $500, with initial retainers reaching $15,000 or more in complex matters.
Identifying the person behind the post is often the first and biggest hurdle. Many disinformation campaigns operate through pseudonymous accounts, which means you may need to subpoena platforms before you know who to sue. Platforms sometimes resist these subpoenas on user-privacy grounds, and the discovery costs stack on top of regular litigation expenses. If you file in a state with a strong anti-SLAPP statute and lose an early motion, you may also owe the defendant’s fees. Those realities are part of why many online falsehoods, even clearly harmful ones, go unlitigated.