Digital acquisition is tough right now.
Costs are up, attention is split across multiple platforms, and most brands are still running the same old playbook: spend on ads, drive to a landing page, cross your fingers.
The challenge with leaning heavily on Meta and Google is that you don't really own that reach. You’re renting it. The moment the algorithm changes or a competitor outbids you, your numbers take a hit and there’s not much you can do about it.
And even when the ads do work, where are they sending people? Usually to a landing page with a form to fill in from a brand they’ve just met 30 seconds ago.
Now, Click-to-WhatsApp ads and social auto-replies are changing things. Rather than pulling someone abruptly out of their feed, you can meet them in the moment on a channel they use daily while growing your WhatsApp subscriber list via paid and organic channels.
What are Click-to-WhatsApp ads?
Click-to-WhatsApp ads are paid social ads that open a WhatsApp chat instead of sending someone to a landing page.
When someone taps a Click-to-WhatsApp ad and messages your business, WhatsApp opens a 72-hour customer service window.
During that window, you can respond and continue the conversation, and send marketing messages without incurring additional WhatsApp messaging fees, as long as replies remain within the service window. That means one paid ad click can open the door to multiple touchpoints, without customers waiting for another page to load or trudging through multi-step forms.
Rather than the traditional ad, website, pop-up form, wait for follow-up trajectory, you get:
Ad → WhatsApp conversation → real-time engagement
The real clincher is that you’re using a channel customers are on every day. WhatsApp isn’t a new environment. It’s where people talk to friends, family, and, increasingly, businesses. That familiarity increases the chance of engagement.
Note that opening a WhatsApp conversation via a Click-to-WhatsApp ad gives you a 72-hour window to reply freely, but it doesn't automatically give you permission to market to them. We recommend using that same conversation to ask for marketing consent while your brand is fresh in their mind. It's also the most cost-effective moment to do it: any marketing template messages you send within the 72-hour window are free, so capturing the opt-in there costs you nothing extra.
What are social auto-replies?
If Click-to-WhatsApp ads are the paid way to grow your WhatsApp subscriber list, social auto-replies are their organic counterpart.
These are automated responses triggered by activity on your social media posts. When someone comments on a post or replies to a Story, a pre-set message goes back to them automatically via DM. That message can ask whether they'd like to hear more from you on WhatsApp, and when they say yes, they're opted in and their profile is either matched to an existing Klaviyo profile or a new one is created.
The key difference from Click-to-WhatsApp ads is where the intent comes from. With Click-to-WhatsApp ads, you're paying to generate it. With social auto-replies, it's already there in the comments and replies your content is already earning. Rather than initiating a WhatsApp conversation, social auto-replies prompt people to opt in, meeting them at the moment they've already shown interest.
This matters for a few reasons. First, it means your organic content is now doing double duty: it's building awareness and growing your WhatsApp list at the same time. Second, the intent signal from someone who's engaged enough to comment is often stronger than someone who clicked an ad. Third, it gives you a WhatsApp list-growth engine that doesn't depend entirely on ad spend.
With Klaviyo, both tactics feed into the same subscriber profile. Whether someone comes in through a paid Click-to-WhatsApp ad or an organic comment on Instagram, the data lands in the same place and triggers the same flows.
Why Click-to-WhatsApp ads and social auto-replies work
The most immediate value of either approach is what the conversation produces: a permission-based WhatsApp subscriber.
Social auto-replies capture people who’ve actively engaged with your post or story and confirmed they want to hear from you. These people are usually much stronger prospects than an ad impression, a cookie, or even an email address collected on a form.
People who find you through a Click-to-WhatsApp ad also give you valuable information. Instead of forcing them into a static experience, the ad invites them into a dynamic one where they can:
- Ask product questions.
- Check availability or delivery times.
- Clarify sizing or fit.
- Request recommendations.
- Confirm eligibility for an offer.
That, right there, is real, expressed, first-party intent, and it’s infinitely more useful than an email address you capture on a form.
Your brand, meanwhile, can respond in real time, which helps reduce objections before a sale. This shifts the role of paid social from simply generating traffic to actively driving qualified conversations.
A quick note on how this works in practice: Click-to-WhatsApp ads are set up in Meta Ads Manager. Klaviyo's role kicks in once a customer clicks the ad and messages the brand on WhatsApp. From there, the brand sets up a subscribe keyword trigger and any automations that cover their key use cases.
Social auto-replies work on the same principle, but the intent signal is arguably even stronger. Someone who stops scrolling to comment on your post or reply to your Story has already engaged publicly with your brand. That's a warmer starting point than a paid ad click, because the interest came entirely unprompted.
Where Click-to-WhatsApp ads are designed to generate intent, social auto-replies capture intent that’s already there.
Both approaches also share another advantage: once someone is on your WhatsApp list, you're no longer dependent on an algorithm to reach them. The relationship may start on a social platform, but it ends up on a channel you own.
How to get opt-in consent on WhatsApp
To send marketing messages on WhatsApp, or to reach that person on email, SMS, or paid channels, you need an explicit opt-in.
Here's how to get it within that 72-hour window. Once someone opens the conversation, you can send a pre-approved template message that asks whether they'd like to hear from you going forward. It's usually something simple: a question and a keyword they can reply with to confirm, like "Reply YES to get updates from us." The moment they do, that consent is captured and synced to their Klaviyo profile, either creating a new one or updating an existing one if Klaviyo already recognises them.
What you don't want to do is treat the 72-hour window as your only chance to sell. Use it to confirm the opt-in and learn something about what they're looking for, for example, through an automated product quiz .
This is what makes Click-to-WhatsApp ads fundamentally different from most paid social formats: the goal is to get someone to subscribe rather than just click a link. Every person who opts in during that 72-hour window becomes part of a WhatsApp audience you own and can market to directly, independent of any algorithm, and without paying for the reach again.
3 high-ROI use cases for Click-to-WhatsApp ads and social auto-replies
Here are 3 scenarios where Click-to-WhatsApp ads and social auto-replies can be particularly powerful:
1. New product launches
Click-to-WhatsApp ads convert passive launch traffic into active subscribers. But your paid ads aren't the only thing generating interest around a launch. Your organic content is too, and social auto-replies mean that engagement doesn't go to waste.
Here's what a launch strategy using both might look like:
- Run Click-to-WhatsApp ads teasing a new product to cold and warm audiences. Use the 72-hour service window to answer questions, share early-access links, and encourage opt-ins with urgency, such as countdown reminders, limited-stock notifications, and exclusive codes.
- Within that same conversation, ask for marketing consent so you can continue reaching them after the 72-hour window closes. Take advantage of the fact that marketing templates sent within that window are free.
- Set up social auto-replies on your organic launch content. Anyone who comments on your Instagram posts or replies to your Stories gets an automatic DM inviting them to subscribe, capturing intent from people who are already engaging with your brand without any extra ad spend.
Both feed into the same Klaviyo profiles, so every opt-in, whether paid or organic, becomes part of the same audience you can market to after launch.
2. Seasonal promotions
High-traffic periods like Black Friday Cyber Monday and holiday campaigns have a lot of opportunity, but the competition is high. Every inbox is overflowing with deals, which means both Click-to-WhatsApp ads and social auto-replies are a good way to stand out and do something more personal.
Instead of driving people to a sale landing page, you can:
- Run Click-to-WhatsApp ads before the sale starts, inviting people to get early access via chat.
- Within that conversation, collect marketing consent and deliver an exclusive early-access code, taking advantage of the fact that marketing templates sent within the 72-hour window are free.
- Build segmented lists of high-intent shoppers based on what they ask about in chat, so you can follow up with relevant offers rather than blanket promotions.
In parallel, set up social auto-replies on your pre-sale organic content. Your posts are already attracting comments and questions from people asking when the sale starts, what's included, and whether a specific product will be discounted. Auto-replies catch those signals automatically. Anyone who engages gets a DM inviting them to opt in to WhatsApp, where they’ll join your early-access list alongside your paid subscribers.
3. Reactivation campaigns
Dormant audiences are often overlooked. You’ve paid to acquire them before and they’ve already engaged with your brand. There’s something there.
Paid reactivation ads can reopen the conversation. Instead of sending lapsed customers back to your website, a Click-to-WhatsApp ad opens a WhatsApp chat that asks what they’re looking for in the moment, shares what’s new since they last purchased, recommends products based on past behaviour, and offers a personalised incentive.
Social auto-replies add an organic layer to reactivation. If a lapsed customer starts engaging with your content again (e.g., by liking posts, commenting on a new collection, or replying to a Story), it’s a good signal that there’s still a relationship there. A social auto-reply can respond to that engagement with an automated message inviting them to opt in to WhatsApp, helping you re-establish the relationship without any spend at all.
How to turn a WhatsApp conversation into a lasting customer relationship
Once subscribers have opted in to receive WhatsApp marketing messages, you can then start to layer in segmentation, automation, and other marketing channels to build a picture of who this person actually is. Here’s how:
Step 1: Build segments based on conversational data
Most segmentation starts with what someone did: they clicked, they bought, they abandoned a cart. But WhatsApp gives you something more. It captures what someone actively chose and expressed. When a subscriber taps a quick reply button or selects an option in an automated conversation, that preference is saved directly to their Klaviyo profile and becomes the basis for smarter segmentation.
Here are a few example segments you might build:
- People who expressed interest in a specific product or category: Quick reply button selections and automated conversation responses are saved to each subscriber's profile, so you can build segments based on what people told you they wanted. A follow-up message that references their specific interest feels personal rather than broadcast.
- Recently engaged subscribers: Segment based on who has replied to or interacted with your WhatsApp messages recently. These are your most active contacts, and worth treating to early access, exclusive offers, or behind-the-scenes content.
- People whose conversations surfaced a customer service issue: If a conversation turned into a support interaction, e.g., following a delayed order, a product issue, or a return, tag those profiles and keep them out of standard promotional sends until the issue is resolved.
- People who engaged with a specific message: Once you start sending WhatsApp marketing messages, you can see who tapped a link and who replied. Someone who tapped through to a product page but didn't buy is in a different place than someone who didn't engage at all, and your next message to each should reflect that.
Step 2: Automate personalised journeys based on behaviour
Once someone has given consent to receive WhatsApp marketing, you can use Klaviyo flows to act on what you already know about them, rather than dropping every new subscriber into the same generic welcome series.
That might include what product category they expressed interest in via a quick reply, which ad brought them in, or whether they've purchased from you before. A flow triggered by opt-in can use that profile data to make the first message feel relevant from the start—acknowledging what they told you they were interested in, rather than starting from scratch.
From there, on-site behaviour can trigger further WhatsApp messages via flows. If a subscriber visits a product page but doesn't buy, you can follow up on WhatsApp. If they've previously purchased a consumable, you can time a message around when they're likely due to reorder. The more a subscriber's profile builds up over time, the more precisely your flows can respond to where they actually are.
Step 3: Earn the right to reach WhatsApp subscribers everywhere else
WhatsApp is where this relationship started, but it doesn't have to be where it stays. The catch is that each channel requires its own opt-in. Consent on WhatsApp doesn't carry over to email, SMS, or mobile push. You need to ask for each one separately.
Once someone is engaged on WhatsApp, you can use that channel to invite them into others—and it's worth being thoughtful about which ones you ask for. WhatsApp and SMS serve a similar purpose: both are mobile messaging channels, and most customers will have a strong preference for one or the other based on where they are in the world.
Beyond mobile messaging, consider how you'll use each additional channel to create a joined-up experience:
- Email: best for longer stories, product launches, and promotions that benefit from more context and visual space.
- Mobile push: best for reminders, personalised recommendations, and anything triggered by recent app or website activity.
- Paid channels: use what you know about your WhatsApp subscribers to find more people like them, or to stay visible to subscribers who've gone quiet.
From paid clicks to owned conversations
The acquisition landscape isn't getting easier. Costs are rising, attention is fragmenting, and the old model (spend on ads, drive to a landing page, hope for the best) is running out of road.
To win the battle, focus on building a WhatsApp audience you actually own from every social touchpoint available. This means two things working in tandem: capturing intent from paid social with Click-to-WhatsApp ads, and capturing intent from organic social with auto-replies.
Klaviyo, the B2C CRM, brings both together in one place, connecting them to everything else you need to turn a new subscriber into a lasting customer relationship:
- WhatsApp opt-in collection and profile sync: Whether someone comes in through a Click-to-WhatsApp ad or a social auto-reply, every opt-in creates or updates a Klaviyo profile automatically so the data from that first interaction is immediately available for segmentation and follow-up.
- Conversational segmentation: Build segments based on what subscribers said, asked, and did, from the products they enquired about to how they've engaged with your messages since.
- Automated flows triggered by real behaviour: Set up a WhatsApp welcome series, browse abandonment messages, replenishment reminders, and post-purchase check-ins that respond to what each subscriber has actually done, not just when they signed up.
- Cross-channel opt-in management: As subscribers give you permission to reach them on email, SMS, and mobile push, Klaviyo tracks and respects those preferences across every channel in one place.
- AI-powered personalisation at scale: K:AI (Klaviyo AI) adapts the content, timing, and channel of every message to the individual so your marketing keeps getting more relevant as your subscriber list grows.
Ready to see how it works? Start a free trial or book a demo to talk through what Click-to-WhatsApp ads and social auto-replies could look like for your brand.
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