Some of the best prospects on LinkedIn sit in the comment sections of posts about the problem you solve, your competitors’ posts included. A person who comments there has told you three things: the topic matters to them, they are active this week, and they hold an opinion you can respond to. Turning LinkedIn post commenters into leads is mostly about choosing the right posts and filtering the right people. Collecting the names is the easy part.

This is the strategy side. For the campaign itself, step by step, see the flow from a post’s commenters to a first conversation.

Why post commenters make good leads, and where they don’t

A comment is a better starting point than a job title for a simple reason: it gives you something to talk about. “Your point about annual contracts” opens a conversation. “I see you’re a VP of Sales” does not.

But a comment section is not a list of buyers. It also holds:

vendors using the thread to promote themselves;
job seekers commenting for visibility;
the author’s colleagues, friends and loyal fans;
your own competitors;
people who comment on everything.

A comment signals interest in a topic, not an intent to buy. Treat commenters as people worth a first conversation, and qualify them like any other lead.

Which posts and accounts to watch

Direct competitors

Watch the personal profiles of their founders, executives and most visible salespeople. Their commenters are often customers, prospects comparing options, or people unhappy with the status quo. Read a few threads before you commit to an account: a comment section full of loyal customers praising the product is a much weaker opportunity than one full of questions.

Adjacent vendors

Companies that sell to the same buyer without competing with you. If you sell sales software, a post from a sales training firm or a revenue operations consultancy draws the people you want.

Practitioners your buyers follow

Operators, consultants and analysts who write for your audience without selling anything like your product. Their comment sections tend to be more candid than a vendor’s.

Your own posts

The warmest commenters of all, since they reacted to you. Nobody finds it odd when the author follows up.

The posts worth mining

Not every post from a good account deserves attention. The ones that surface buyers:

posts that describe a problem (“our renewal process is broken, how do you handle it?”);
questions asking for recommendations or comparisons;
opinion posts about how your category should work.

The ones that don’t: job announcements, milestone celebrations, motivational posts and engagement bait, where the comments say more about the author’s reach than about the commenters’ needs.

Qualifying the people who comment

Three questions per person, in this order:

Do they fit? Role and company, from the headline. Would they buy, or influence the purchase?
What did they write? A question or a described situation is worth far more than “Great post”. A comment that disagrees is often the best opening of all.
Is anything disqualifying? A vendor, a job seeker, a competitor, a member of the author’s own team.

The first question does not scale by hand. In Swimlane you describe your ideal customer in a plain paragraph, and each contact gets one of five fit levels, from very low to excellent, with a one-line reason. On a campaign’s audience you then set a floor such as “Medium match or better”, so poor fits never enter the sequence. How ICP fit levels are assigned is explained on its own page. The second question stays with you: skim what someone wrote before you write to them.

Approaching commenters without being creepy

Everything in a comment section is public, but people still notice when an approach feels like surveillance.

Reference the discussion, not your monitoring. “Your point on annual contracts in Marc’s thread” sounds natural. Anything that suggests you watch everyone who comments on a competitor does not, and naming the competitor in a first note is rarely wise.
Let a day pass. A connection request an hour after a comment looks automated, because it is.
Keep the note short. 200 characters on a free account, and free accounts only get a few personalised notes a month, so spend them on the best fits.
Continue the conversation rather than start a pitch. The first message after acceptance asks about what they wrote.
Take silence as an answer. If the request is ignored, like one of their posts later and move on. No second request a week later.

A note that respects all of that, for a list built from one post’s commenters:

Hi {firstName}, your comment on Marc's post about annual contracts was the
most useful one in the thread. I work on SaaS pricing too, happy to connect.

Everyone in that list commented on the same post, so the sentence is true for all of them. The first message, two days after they accept:

Thanks for connecting, {firstName}. You pushed back on annual contracts in
that thread. Did you end up changing the model, or is it still a debate?

When you have something genuinely useful to add, reply to their comment publicly first. Your request then arrives with a context they have already seen.

Keeping the source running

Watching a handful of accounts by hand works for a week. After that it depends on remembering, which is why it stops. In Swimlane the sourcing runs on its own:

Post Engagement imports the commenters of one post from its URL, profiles resolved, into a new list.
Competitor Engagement takes a competitor’s profile URL and imports the people who commented on their five latest posts.
Auto Competitor Engagement and Auto Post Engagement do the same on a schedule, every few hours at random intervals and only inside your office hours, adding new commenters to one dedicated list.
Auto Profile Engagement does it for the commenters on your own five latest posts.

Point a campaign at one of those recurring lists and it becomes a standing flow: a campaign keeps enrolling new members of its source list, so fresh commenters enter the sequence as they arrive, the ICP floor keeps poor fits out, and everyone else stays in your contacts for later. The LinkedIn prospecting product page lists every sourcing channel.

Ethics and volume

Public comments are fair to read. They are not consent to a five-message sequence. Keep your requests inside sensible daily ceilings, write every message as if the recipient might screenshot it, and never imply a relationship you don’t have. Commenter outreach works because it is relevant, and it stops working the moment it turns into volume. Pacing and limits are covered in LinkedIn automation without getting banned.

What to measure

Acceptance rate per source. Compare a competitor’s commenters with your own posts’ commenters; the gap tells you where to spend your weekly invitations and your notes.
Replies per source. Each import lands in its own list, and one campaign per list keeps the numbers separate.
Conversations that reach your pipeline. A source with lively replies and no meetings is full of interesting people, not buyers.

Drop the sources that produce conversations with the wrong people, however busy their comment sections look.

How to turn LinkedIn post commenters into qualified leads