You post a one-star review about a local plumber. You write that he showed up late, overcharged you, and left a mess. That is your honest opinion based on your experience. It is protected speech. Now imagine you write that the plumber is a convicted fraudster, that he stole tools from your house, or that his license has been revoked. If those statements are false, you have just crossed the line from opinion into defamation. The shift is subtle but legally dangerous. Understanding that line is critical for anyone who writes online reviews, runs a business, or manages a social media account.
Defamation in the context of online posts comes down to one core question: did you state a false fact about a person or business that damaged their reputation? Opinions are not defamatory. Hyperbole is not defamatory. But a claim that can be proven true or false is a statement of fact, and if it is false and harmful, you can be sued. The law gives no special protection to anonymous reviewers, angry customers, or people hiding behind fake profiles. The same rules apply to a tweet, a Facebook comment, a Yelp review, or a Reddit post.
To understand when a negative review becomes defamatory, you need to focus on three things. First, is the statement verifiable? A sentence like “This restaurant serves the worst pizza in town” is an opinion. You cannot prove it wrong in a court of law. But “This restaurant uses expired cheese in their pizza” is a factual claim. Someone can check the expiration dates. If the cheese is fresh, the statement is false. The second element is harm. Did the false statement cause measurable damage? A single bad review buried among dozens of good ones may not hurt much. But a viral post claiming a contractor is a scammer can cost them thousands of dollars in lost business. The third element is fault. In most cases, the person who posts must have known the statement was false or acted with reckless disregard for the truth. If you simply repeated what a friend told you without checking, a court may find you negligent.
The most common trap people fall into is mixing opinion with false factual assertions. You might write, “I think the electrician is a thief because he charged me double the quote.” The first part is opinion, but the second part is a fact: you were charged double. If that double charge is true, no defamation. If it is false, the word “think” does not protect you. Courts look at how a reasonable reader would understand the post. If a reader would take away a factual accusation, then it is treated as a statement of fact regardless of how you phrased it.
Another frequent mistake is claiming a business is “scamming” customers. The word “scam” implies intentional fraud. If you have no evidence of fraud, and you are just frustrated with slow service or a product that did not meet expectations, calling it a scam is a factual accusation that can be defamatory. Similarly, saying a doctor is “incompetent” is often treated as an opinion if based on a single bad experience, but calling that doctor “unlicensed” or “malpracticing” is a factual claim that requires proof.
What about sharing someone else’s post? If you retweet, share, or forward a defamatory statement, you can be held liable just as if you wrote it yourself. The law treats republication as publication. A simple “share” button does not absolve you. The same goes for commenting on a defamatory post with your own endorsement. Even a like or a heart can be interpreted as adopting the false statement, depending on the context.
Businesses also need to know how to handle false reviews themselves. If a competitor posts a fake negative review, the business can sue for defamation. But the first step is usually to report the review to the platform. Most platforms have policies against false content and will remove it if you provide evidence. If the damage is severe or the poster is persistent, a lawsuit may be necessary. However, suing an anonymous reviewer requires a subpoena to identify them, which costs time and money.
The bottom line is simple. Before you post anything negative about a person or business online, ask yourself: can I prove this statement is true? If the answer is no, keep it to yourself. If you are expressing an opinion, make sure you clearly label it as such and stick to describing your personal experience. Avoid name-calling, accusations of illegal behavior, and sweeping claims about competence or honesty. One angry post can turn into a defamation lawsuit that costs you thousands in legal fees and damages. In the world of online reviews, honesty is not just the best policy—it is the only safe one.
