> **The principle.** A comment isn't read in full first: people read **the first line**, and decide in one second whether to keep going or scroll past. In a comment thread under a high-engagement post, your opener is competing with ten others. This guide covers ONLY that first line: the opening formulas that stop the scroll, what kills attention from the first word, and concrete examples. For the full method of a good comment, see [write a good comment](/en/blog/ecrire-bon-commentaire-linkedin); here we zoom in on the hook. ## Key takeaways - **The first line is the magnet.** In a dense thread, it decides whether your comment gets read — angle and question are useless if they're never reached. - **Openers that work: surprise, contrarian take, a number, lived experience.** Curiosity and contrarian hooks outperform the rest ([ConnectSafely, 2026](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026)). - **What kills attention: "Great post!", echoing the post, the empty compliment.** These openers are treated as noise. - **Reference a specific detail of the post in the first line**: it's the fastest "I read it" signal. - **Brevity.** A short opener stops the scroll better than a sentence that drags. ## 1. Why the first line decides everything In a comment thread, nobody reads each contribution in full. The eye scans the **first words** of each comment and stops — or doesn't. It's the same mechanism as for posts: LinkedIn only shows the first lines before "see more", and the first line determines most of the engagement ([ConnectSafely, 2026](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026)). Direct consequence: you can have the most relevant angle, the best question, perfect personalization — if your first line doesn't grab, **none of it gets read**. The opener isn't a cosmetic detail; it's the access condition to your comment's value. Everything else in [the method](/en/blog/ecrire-bon-commentaire-linkedin) depends on that first second. ## 2. The opening formulas that stop the scroll Here are the families of openers that work, with their logic: - **The contrarian take**: you go against the grain of the post's idea. "Actually, I think it's the opposite…". Contrarian and curiosity hooks clearly outperform the rest ([ConnectSafely, 2026](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026)). - **The number / the concrete**: you open with a data point from your experience. "I tested this on 40 prospects: …". A number stops the eye because it promises something concrete. - **Lived experience**: "I made exactly this mistake last year…". First person creates instant connection. - **The micro-story**: "A client told me this last week…". A story opens a loop the reader wants to close. - **The precise reference to the post**: "Your point on [X] specifically…". You prove you read it from word 1. The common thread: these openers **promise something** (a surprise, proof, a story). That's what holds the eye. For openers embodied in full comments, browse our [comment examples](/en/blog/exemples-commentaires-linkedin). ## 3. What kills attention from the first word Conversely, some openers doom your comment before it begins: - **"Great post!" / "So true 🙌"**: the empty compliment is the zero degree of an opener. It promises nothing, adds nothing, and is now treated as engagement noise. - **Echoing the post**: restating what the author just said ("So basically you're saying…"). The reader already read it from the author. - **Complimenting the author**: "Great work, as always!". It flatters, but adds nothing for the scrolling reader. - **The corporate opener**: "Very interesting, thanks for this quality share." Generic, interchangeable, forgettable. - **The lone emoji or the "+1"**: it says nothing and doesn't stand out. The common point: these openers **promise nothing**. And without a promise, no reason to stop. For the full list of traps, see our [comment mistakes](/en/blog/erreurs-commentaires-linkedin). ## 4. Reference the post from the first line The most reliable technique for an opener: **cite a specific detail of the post in your first line**. Not "great post", but "Your 30% figure surprised me because…". This opener does three things at once: it proves you read it, it anchors your comment in the specific post, and it creates expectation (why surprised?). It's also the mark of a non-generic comment — the opposite of the copy-paste posted under ten publications. The author notices it, the algorithm values it, and the thread reader sees you bring something specific. The precise reference is the opener that requires no special talent: you just need to have actually read. ## 5. Keep the opener short An opener that drags loses its effect. In the mobile feed, a short, crisp first line stops the scroll better than a long-winded sentence ([ConnectSafely, 2026](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026)). The idea: your first line should be readable **at a glance**. Careful not to confuse: it's the **opener** that must be short, not the whole comment. The full comment benefits from being 15-40 words of substance — a comment of 250+ characters generates ~2x more impressions than an ultra-short one *(LinkHub, 657,722 comments — see [comment length](/en/blog/longueur-commentaire-linkedin-impressions))*. The ideal structure: **short opener that stops → body that brings the angle → question that opens**. ## 6. How do you find the opener fast, every time? The real problem with the opener isn't knowing which one works — it's finding one **for every comment, several times a day**, without spending five minutes on it. That's where AI helps. LinkHub's [personalized AI comments](/en/features/ia-commentaires-personnalises) propose a comment anchored in the post — opener included — trained on **your** style, which you approve before publishing. The AI does the first draft of the opening; you keep the voice and the control. With LinkHub, the average time to write a comment drops to **~29 seconds** *(n = 44,523)*. And to get good openers, you still need to comment **early**, under the right posts: commenting within 0-30 minutes earns **~3.8x** more impressions than after 24h *(LinkHub, 261,137 comments — see [when to comment](/en/blog/quand-commenter-sur-linkedin))*. Gather your key creators into [personalized feeds](/en/features/feeds-personnalises) to catch the window before the thread is saturated. ## FAQ **What makes a good LinkedIn comment opener?** A first line that **promises something**: a contrarian take, a number from your experience, a micro-story, or a precise reference to the post. It stops the eye in the thread and gives a reason to read on. **Which openers should I absolutely avoid?** "Great post!", echoing the post, the empty compliment, the generic corporate opener, and the lone emoji. They promise nothing, so they hold no one — and are treated as noise. **How long should the opener be?** Short: a first line readable at a glance stops the scroll better ([ConnectSafely, 2026](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026)). But the whole comment benefits from 15-40 words ([length](/en/blog/longueur-commentaire-linkedin-impressions)). **Is referencing the post enough as an opener?** Often yes. Citing a specific detail ("your 30% figure…") proves you read it, anchors the comment and creates expectation — all without special talent, just by having actually read. **Can AI write my opener?** Yes, as an assistant. LinkHub's [personalized AI comments](/en/features/ia-commentaires-personnalises) propose an opening trained on your style, which you approve — average time ~29s *(n = 44,523)*. ## Sources & methodology - **LinkHub first-party data** — length (657,722 comments, measured impressions), timing (261,137 comments, 0-30 min ~3.8x vs 24h), writing time with LinkHub (~29s, n = 44,523). See [comment length](/en/blog/longueur-commentaire-linkedin-impressions), [when to comment](/en/blog/quand-commenter-sur-linkedin). - [ConnectSafely — LinkedIn Hooks That Stop the Scroll (2026)](https://connectsafely.ai/articles/linkedin-hooks-engagement-guide-2026) · [AuthoredUp — How to Write LinkedIn Comments That Get Noticed (2025)](https://authoredup.com/blog/commenting-on-linkedin-posts) - Find all our studies on the [LinkHub blog](/en/blog).