Is it backbiting to complain about someone online?

Yes, often. Posting about someone's faults in a way they would dislike is backbiting (ghibah), even if it's true, and online it reaches far more people and stays there. But there are exceptions: seeking justice, warning others about real harm, or giving an honest, fair review.
What counts as backbiting
The Prophet ﷺ explained that backbiting is mentioning your brother with something he dislikes. If it's true, it's backbiting; if it's false, it's slander (Sahih Muslim 2589). The Quran describes it in a very vivid way:
Vague posts count too. If your friends can easily tell who "a certain coworker" or "someone in my family" is, leaving out the name doesn't change much.
Why online is heavier
A complaint said to one friend fades. A post can be screenshotted, shared and found years later. The Prophet ﷺ said in his farewell sermon that people's blood, property and honor are sacred to one another (Sahih al-Bukhari 67). Damaging someone's reputation in front of hundreds of people is a serious matter.
When speaking up is allowed
"Allāh does not like the public mention of evil except by one who has been wronged" (Quran 4:148). Classical scholars such as Imam an-Nawawi listed situations where mentioning someone's wrong is allowed, including:
- Seeking justice: reporting someone to the police, an employer, a platform or a court.
- Warning others: exposing a scammer, abuser or dangerous person, sticking to facts.
- Asking for advice: describing a situation to get help, ideally without naming anyone.
- Fair reviews: sharing an honest experience with a business or service.
Even then, say only what's needed, stay truthful and leave out insults.
Before you post
Ask yourself: Is it true? Is it necessary? Would a private conversation fix it? Am I trying to solve a problem, or just get people on my side? The Prophet ﷺ said that whoever believes in Allah and the Last Day should say what is good or keep silent (Sahih al-Bukhari 6018).
Make sure what you share is accurate, too. See Is it a sin to share fake news online as a Muslim?
- Mentioning someone's faults that they'd dislike is backbiting.
- Vague posts still count if people can tell who it is.
- Seeking justice, warning others and fair reviews are exceptions.
- Say only what's needed, truthfully and without insults.
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