The idea, in one sentence. For a recruiter, commenting isn't small talk — it's warm sourcing. By commenting where your ideal candidates spend their days, you become visible before you reach out: your employer brand works for you, and your InMail no longer comes out of nowhere. This guide gives the method, concrete examples and is backed by our first-party LinkHub data. Third-party figures are estimates from cited, dated studies. No invented numbers.
Key takeaways
- Your "client" is candidates (not prospects who buy). Your comment ICP = the creators and communities your ideal candidate follows, not necessarily HR accounts. (see the ICP of a comment)
- Commenting makes you visible to passive candidates — the ones who never open a job post but read their feed. That's where warm sourcing happens.
- A comment is seen ~179 times on average (n=657,722), whether you have 200 or 20,000 followers: its reach depends on the host's audience — the professional community you comment under.
- The right host changes everything: commenting on a top-10% creator in your target field earns ~3.4x more impressions than the median. (see who to comment on)
- Timing too: commenting in the first 30 minutes earns ~3.8x more than after 24h (n=261,137). (see when to comment)
- The real goal: warm the relationship before the approach. A candidate who has already seen you comment usefully replies better than a stranger. Comments feed your employer brand and prime the DM.
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1. Why commenting is a sourcing lever (not a waste of time)
Most great candidates are passive: they don't apply, don't browse job posts, but they read their feed every day. You'll never reach them with a listing. You can, however, show up in front of them by commenting on the posts they already read.
That's exactly what a comment does: it borrows the host's audience. When you comment usefully on an influential senior developer's post, every developer who follows them — your ideal candidates — sees your name, your title, and the idea you're putting forward. You exist for them before you reach out.
On the numbers: a comment is seen ~179 times on average across our base of 657,722 comments. That's not empty reach: it's reach in front of the right professional community, provided you pick the host well (step 2). And it matters: employer brand remains a major attraction factor — candidates trust what an employee says 3x more than the brand's corporate messaging (LinkedIn, Future of Recruiting 2025). Your commenting activity is that employee voice, made real.
If you want to reach candidates without posting job ads or HR content, the general logic is detailed in grow on LinkedIn without posting.
2. Defining your recruiter ICP: who to comment under?
This is lever #1. For a recruiter, the classic mistake is commenting among HR peers, under talent acquisition posts. But your candidates aren't there — they're in their professional community.
Your comment ICP is the creators your ideal candidate follows:
- Tech: dev creators, tech leads, accounts that talk architecture and engineering careers.
- Sales: sales/social selling creators, accounts sharing closing methods.
- Design / product: recognized UX creators and product managers in your niche.
- And your named prospects: the specific candidates you target — commenting under their posts starts the relationship directly.
At equal effort, who you comment under swings your visibility by a factor of 1 to 40+. Across 4,861 creators, the median earns 36 impressions/comment, a top 10% 124 (~3.4x), a top 1% 357 (~10x). The same comment, placed under the right professional host: seen 3 to 10x more (see who to comment on). And reach concentrates on these big creators — their share of visibility rose from 15% to 31% between 2022 and 2025 (van der Blom, 2025).
To avoid guessing, LinkHub's AI profile recommendation infers your sourcing ICP and finds, across 100,000+ profiles, the highest-ROI hosts for your target field. The full conceptual method is in the ICP of a comment.
3. Comment early and well (the mechanics that pay)
Two reflexes make the difference: being early and writing well.
Early. A comment posted in the first 30 minutes generates 391 impressions on average, versus 104 after 24h — about 3.8x (n=261,137; see when to comment). A post gets most of its reach in its first hour: commenting then exposes you to the audience peak. Since you can't watch the feed nonstop, group your target hosts into personalized feeds to see their posts the moment they go live.
Well. A useful comment adds a precise observation, a piece of experience, or a question that extends the discussion. Aim for 15-40 words — a 10+ word comment weighs far more than a like in the algorithm. For a recruiter, the winning tone is human and sincere, never "we're hiring, DM me." The detailed mechanics are in writing a good comment and the comment examples.
4. A concrete recruiter comment example
Say you recruit back-end developers, and an influential tech lead publishes a post about technical debt in startups. A bad comment would be "Great post! We're hiring devs, DM me." — read as spam, and adds nothing.
A good comment instead:
"The bit about debt we knowingly take on to ship fast really hits. On our team we settled it: we log every 'deliberate debt' in a dedicated file, and force ourselves to repay it before each new cycle. It changed how the devs relate to legacy — less frustration, more ownership. How do you handle the trade-off against deadlines?"
Why it works: it's useful, it shows your team culture (employer brand made real), it asks a real question, and it sells nothing. The developers reading that thread see a recruiter who speaks their language. Several will click your profile. Some will already know you when you reach out — and a warmed candidate replies better than a stranger.
With LinkHub, spotting the right post the moment it drops and writing a personalized AI comment (always reviewed by you) takes ~29s measured (median, n=44,523) — so 5-10 targeted comments a day fit into a few minutes.
5. From comment to candidate: moving to DMs
The comment is only the first handshake. The goal is the conversation.
- Commenting makes you visible to passive candidates and their professional community.
- Replying in the thread builds a first, natural public connection.
- Moving to DMs turns that connection into a warm approach: "I saw our exchange under [X]'s post, and your point on [Y]. We're looking for exactly that profile — keen to talk?" Far more effective than a cold InMail.
- Building a talent pool: by commenting consistently in the same community, you build a network of talent who know you and refer you.
This relationship logic is what turns borrowed visibility into applications. Keep your target communities at hand in personalized feeds to nurture the connection day after day.
FAQ
Does commenting really help sourcing, or is it just image? Both. Commenting makes you visible to passive candidates (who never browse listings) and warms the relationship before your approach. A candidate who has already seen you comment usefully replies far better than to a cold InMail.
Who should a recruiter comment under? Not among HR peers. Under the professional creators your ideal candidates follow (dev, sales, design…) and under your named candidates' posts. A top-10% creator in the niche earns ~3.4x the median. See who to comment on and the AI profile recommendation.
Should you say "we're hiring" in the comment? No. A comment that pitches a role reads as spam. Add value (experience, a question, a viewpoint); your profile and the DM do the rest.
How many comments per day for a recruiter? Aim for 5-10 targeted comments/day. With LinkHub (~29s per comment), that fits in a few minutes. The routine structure is detailed in comment routine.
Does commenting help employer brand? Yes. Candidates trust an employee's voice 3x more than corporate messaging (LinkedIn, 2025). Your comments are that voice made real, seen by the right professional community.
Sources & methodology
- LinkHub first-party data — 179 average impressions/comment (n=657,722); creators commented on (4,861: p50=36, p90=124, p99=357, max=1,522); timing (n=261,137); measured writing time (n=44,523); base of 100,000+ profiles. See who to comment on, when to comment.
- LinkedIn — Future of Recruiting 2025 · van der Blom — Algorithm InSights Report 2025
- Find all our studies on the LinkHub blog.
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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