How to Capture Email Leads From Facebook Ad Comments (And Send Them to Klaviyo)

The Email Channel You're Ignoring Is Right There in Your Ad Comments

Every brand running Facebook ads is obsessed with the same funnel: click, landing page, email capture, purchase. But there's a second funnel happening in plain sight, and almost nobody is working it. It lives in the comment section of your ads.

People who comment on your Facebook ads are not passive scrollers. They stopped. They read your ad. They had a reaction strong enough to type something. That is purchase intent, and it is being wasted at scale.

According to Superpower's State of Facebook Ad Comments 2026, an analysis of 4,365 active Shopify brands, the average active ad has 3.2 unanswered purchase-intent questions sitting in its comment section. These are people asking about sizing, shipping, ingredients, returns, and availability. One good answer away from buying. Instead, they wait. And most never hear back.

That's the problem. Here's the opportunity: if you can move those commenters into a DM conversation and collect their email addresses, you can sync them directly to Klaviyo, tag them as social-sourced leads, and run flows built specifically to convert them.

Why Facebook Ad Comments Are an Underused Email Capture Channel

Most brands treat email capture as a website problem. Pop-ups, exit intent, embedded forms, gated discounts. These work, but they only catch people who made it to your site.

Comment-to-email capture meets people where the interest is already happening, before they've decided whether to click through at all.

The intent signal is already there. A comment like "does this come in wide width?" is a declared interest signal. The person is evaluating a purchase. Getting their email at that moment is dramatically more valuable than a random opt-in from someone who clicked a pop-up.

The volume is real. If you're running multiple ad sets, the comment volume compounds quickly. Brands that treat comment sections as a lead channel capture a stream of warm, pre-qualified contacts that most competitors are ignoring entirely.

The competition for this channel is low. Paid social is crowded. SEO is competitive. The comment-to-DM-to-email flow is still underbuilt by most brands. That gap closes eventually. It's worth moving on it now.

For more on how purchase intent shows up in social comments, see our full breakdown of purchase-intent AI for social media comments.

How the Comment-to-DM-to-Email Flow Works

The flow has three stages. Each one is simple. The combination is what makes it powerful.

Stage 1: Comment detection and trigger

The flow starts when someone leaves a comment on one of your Facebook ads. Not every comment qualifies. The system watches for specific signals: purchase-intent questions, pricing and shipping mentions, size or availability queries, and positive engagement like tagging a friend or expressing interest.

When one of those signals is detected, the system triggers an automated DM to the commenter through Facebook Messenger. Speed matters. Top-performing brands respond in an average of 47 minutes. The median brand takes more than 18 hours. That gap is where leads go cold.

Stage 2: The DM conversation

The DM is not a form. It is not a bot script that asks "what is your email address?" That kills conversions.

The DM is a natural conversation that answers the commenter's question first, then earns the right to ask for their email. The AI sees the sizing question, answers it directly, and then offers to send personalized sizing recommendations or a discount code by email. The email ask comes after value is delivered, not before.

This is where AI matters. A scripted bot can only handle the exact phrases it was trained on. An AI-powered conversation handles nuance. If the person goes off-script, the AI follows the thread instead of breaking down. The conversation feels human because it responds to what the person actually said.

Stage 3: Email collection and sync

Once the person shares their email in the DM, that address is captured and pushed to Klaviyo. It arrives tagged with source data: which ad, which comment type, what the person asked about. That tagging is what makes the downstream flows work properly.

What Triggers a DM Conversation

Not every comment should trigger a DM. The triggers that work are the ones where a DM adds genuine value.

• Purchase-intent questions: "Does this work for sensitive skin?" or "What sizes do you carry?" These people want information. A DM that answers the question is genuinely useful.

• Pricing or shipping questions: "How much is shipping to the UK?" These are high-intent signals. The person is calculating whether to buy.

• Tagging behavior: When someone tags a friend on an ad, both people showed interest. The tagger is a warm lead.

• Positive sentiment with no click-through: Comments like "I need this" with no subsequent purchase. The intent is there. They just haven't converted.

• Keyword triggers: Custom keywords based on your product category. A supplements brand might trigger on "protein" or "vegan." A skincare brand on "retinol" or "acne."

One category requiring careful handling: negative comments. Superpower's research found that 69% of Shopify brands have unanswered negative comments sitting on their active ads. Responding to them publicly and following up by DM can turn a detractor into a retained customer. See our complete guide to Facebook ad comment management for how to handle the full comment spectrum.

How AI Handles the DM Conversation Without Sounding Like a Bot

The difference between a scripted bot and an AI-powered conversation is the difference between a vending machine and a sales rep.

Scripted bots work through a decision tree. If the user says something unexpected, the bot either gives a wrong answer or breaks entirely. Users recognize bots instantly. Trust drops. Conversion drops with it.

AI conversations are adaptive. The system reads the comment that triggered the DM, understands the context, and opens with a response specific to what that person said. The conversation starts where the customer is, not where the script starts.

The email ask comes when it fits naturally, after the core question is answered. The AI might say: "I can also send you our full ingredient guide along with a discount code if you want to drop your email." The person gets something for their email. The ask feels like an offer rather than a demand.

For a broader look at how AI agents work across social media for Shopify brands, see our guide to social media AI agents for Shopify.

How the Email Syncs to Klaviyo With Proper Tagging

Source tagging. Every contact collected through the comment-to-DM flow should arrive in Klaviyo tagged with a source label like source: facebook-ad-comment. They behave differently from website opt-ins and should receive different flows.

Intent tagging. If the system captures what the person asked about, that data should sync to Klaviyo too. A contact who asked about sizing gets tagged accordingly. These tags become segmentation handles for your flows.

Ad-level attribution. Passing the ad ID or campaign name through to Klaviyo lets you track which ads are generating email leads downstream. That changes how you allocate budget.

Consent handling. Because the email was collected through a DM conversation rather than a standard opt-in form, your implementation should confirm explicit consent during the DM exchange. Contacts who knowingly opted in have better engagement rates.

What Flows to Set Up in Klaviyo for Social-Sourced Leads

These contacts are not the same as your standard email subscribers. They came in through a conversation. They were warm but not committed. Your flows should reflect that.

The social welcome flow. Do not dump these contacts into your standard welcome series. Build a dedicated welcome flow for contacts tagged with source: facebook-ad-comment. The first email should reference where they came from. If a discount code was offered in the DM, deliver it in email one.

The intent-based follow-up flow. If you captured intent tags, build flows that speak to what the person actually asked about. A contact who asked about a specific product gets a sequence that highlights that product and makes purchasing easy.

The social-sourced browse abandonment flow. If a contact from your comment flow visits your site and browses without purchasing, standard abandonment flows will catch them. But a lighter touch that references the original conversation can feel warmer than a generic "you left something behind" email.

The re-engagement flow. Social-sourced leads sometimes go cold faster than website opt-ins. Build a short re-engagement sequence for contacts who haven't opened in 30 days: a reminder of what they asked about, a clear offer, and an easy path to unsubscribe if they're not interested.

The Compounding Return

Most brands treat ad spend as a one-time cost per click. Comment-to-email capture changes that math. Every warm lead captured from a comment section is a contact who continues to receive value from your email program long after the ad impression is paid for.

The ad gets the click. The comment section generates the conversation. The DM captures the email. Klaviyo converts the subscriber. That's a four-stage funnel built on top of ad spend you're already running.

The brands that build this system early capture an audience that compounds. The ones that don't keep paying for attention without converting it.

Book a demo with Superpower and see how the comment-to-DM-to-Klaviyo flow works with your actual ads and your actual products.