The principle. A good LinkedIn comment isn't luck: it's an anatomy. Relevance, useful length, an added angle, a genuine question, personalization — each lever is measurable, and we measured it on our first-party data (657,722 real comments). This guide breaks down, step by step, how to write a comment that gets seen — and how AI helps you write it fast without losing your voice. Every tip is backed by a number and the matching study.
Key takeaways
- A comment = ~179 impressions on average in front of a qualified audience — far more than the like counter suggests (0.90). (LinkHub, 657,722 comments — see comments vs likes)
- Relevance beats volume. A "Great post!" is treated as noise; what counts is what you add to the post.
- Aim for 150+ characters (~15–40 words). A comment of 250+ characters generates 261 impressions on average versus 131 under 50 characters (~2x). (length)
- Ask a real question. Comments with a question get +23% replies and +40% impressions. (question → replies)
- Personalize: reference a specific sentence from the post. That's the mark of a comment that was read, not skimmed.
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1. Add value: relevance > volume
The reflex "Great post!" or "So true 🙌" does nothing — worse, these generic comments are now treated as engagement noise and can be devalued (AuthoredUp, 2025). A good comment adds something the post didn't say: a data point from your experience, a counter-example, a different angle.
Why is this the #1 lever? Because it's what the LinkedIn algorithm rewards. An average comment generates ~179 impressions in front of a qualified audience — about 199 impressions for every like received (LinkHub, 657,722 comments — see comments vs likes). But that reach isn't automatic: it's earned through substance. An empty comment, even posted early, triggers neither replies nor redistribution.
Do this: before writing, ask yourself "what am I adding that others haven't said?". If the answer is "nothing", move on.
2. Hit the right length: 15–40 words (150+ characters)
Length is not a detail. Across 657,722 real comments, average impressions climb with length:
| Length (characters) | Avg. impressions |
|---|---|
| < 50 | 131 |
| 50–99 | 148 |
| 100–149 | 164 |
| 150–249 | 205 |
| 250+ | 261 |
A comment of 250+ characters generates ~2x more impressions than one under 50 characters (261 vs 131). The threshold where it takes off: 150+ characters, i.e. ~25–40 words (comment length). This is consistent with industry sources: a comment of 15 words or more reportedly carries ~2.5x more algorithmic weight than a short one (AuthoredUp, 2025).
Honest nuance: the median impressions stay flat (~34–38) across all buckets. Lengthening an empty comment doesn't make it take off — it's length + relevance that pays. Aim for 15–40 words of substance, not an artificially inflated essay.
3. Add an angle, don't summarize
Many "long" comments just restate the post. That's better than "Great post!", but it opens nothing. The right move is to add an angle: a reasoned disagreement, a nuance, a concrete case from your industry.
Industry guides converge on a simple three-step frame (AuthoredUp — How to Write LinkedIn Comments That Get Noticed, 2025):
- Hook — reference a specific sentence, number or idea from the post (shows you read it, not skimmed it).
- Value — add something new: a data point from your experience, an example, a different perspective.
- Opening — end with a question or an invitation to react (see §4).
This frame turns a passive comment into a contribution. That's exactly what a good comment aims for: to move the conversation forward, not repeat it. (To see the frame applied, browse our LinkedIn comment examples.)
4. Ask a real question
The most underused lever: only ~9% of comments contain a question. Yet across 657,786 comments, those with a "?" get +23% replies (0.86 vs 0.70) and +40% impressions (242 vs 173) (question → replies).
The mechanism is simple: a question calls for a reply → a thread forms → LinkedIn redistributes beyond the initial audience. Conversation is the fuel of reach, and it's the signal the algorithm rewards most.
Caveat: this is a correlation, not a magic recipe. A relevant question that extends the post's idea works; a tacked-on one ("Right?") doesn't. "How do you handle this when the client refuses?" beats "Do you agree?".
5. Personalize: show you read the post
A good comment is anchored in the specific post. Quoting an exact sentence, building on the cited number, naming the example the author gave — all signals that an attentive human read it, not a generic copy-paste. That's the difference between a comment that builds a connection and one that goes unnoticed.
Personalization is also what makes a comment not read as generic: both the algorithm and the post's author value a specific contribution. It's the opposite of "Great post!" pasted under ten posts in a row.
6. How to write fast and well with AI?
Combining all five levers — relevance, length, angle, question, personalization — on every comment, several times a day, is demanding. That's where AI helps: not to automate blindly, but to quickly draft a quality comment that you approve.
LinkHub's personalized AI comments are trained on your style: they propose a comment anchored in the post, at the right length, that adds an angle and asks a question when useful — in your voice, not a generic corporate tone. You always approve before publishing: the AI does the first draft, you keep control and the voice.
To apply the method at the right time, you still need to find the right posts to comment on as soon as they go out. That's the role of personalized feeds: gather your prospects and key creators to comment early, without scrolling the native feed. To explore all our data, browse our LinkedIn studies.
FAQ
What makes a good LinkedIn comment? A relevant comment (that adds an angle, not a "Great post!"), of useful length (15–40 words / 150+ characters), that personalizes (references a specific sentence from the post) and often asks a real question. These levers are measured in our data: +impressions with length, +23% replies with a question.
How long should a good LinkedIn comment be? Aim for 150+ characters (~15–40 words). A comment of 250+ characters generates ~261 average impressions versus 131 under 50 characters (~2x). But long and relevant — not long for the sake of it.
Should I ask a question in my comment? When the topic lends itself to it, yes: comments with a question get +23% replies and +40% impressions in our data. As long as the question is genuine, not tacked on.
Can AI write my LinkedIn comments? Yes, as a writing assistant. LinkHub's personalized AI comments propose a draft trained on your style, which you approve before publishing — you keep your voice and control.
How many impressions does a comment earn? On average ~179 impressions per comment in front of a qualified audience. See comments vs likes.
Sources & methodology
- LinkHub datasets — length (657,722 comments), question/replies (657,786 comments), value (657,722 comments), all with measured impressions. Correlational analyses.
- AuthoredUp — How to Write LinkedIn Comments That Get Noticed (2025) · AuthoredUp — How the LinkedIn Algorithm Works (2025)
- Related studies: comment length · question → replies · comments vs likes · when to comment
About the author
Founder of LinkHub
Yannis writes about social selling, LinkedIn comments and visibility. He builds LinkHub, the extension that helps you attract qualified clients through your comments.
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