How Comment Sections Became the New Marketing Channel
Something strange has happened to comment sections. They used to be where trolls lived and arguments festered. Now they're
Something strange has happened to comment sections. They used to be where trolls lived and arguments festered. Now they’re prime real estate for brands trying to sell you stuff without looking like they’re selling you stuff.
Scroll through any viral post on TikTok or Instagram and you’ll find them: Duolingo making threats, Wendy’s throwing shade, skincare brands cheering on beauty creators. The comments aren’t just banter anymore. They’re carefully engineered marketing moves dressed up as casual conversation.
Welcome to engagement farming, where your laugh is the product and brands have figured out how to harvest it at scale.
When Brands Stopped Posting and Started Lurking
A video goes viral. Could be anything. Someone’s wedding disaster, a cooking fail, a random dance trend. Within hours, brand accounts swoop in with perfectly timed comments designed to make you pause mid-scroll.
The format is familiar by now. A witty one-liner. A self-aware joke. A reference that shows the brand “gets it.” If done well, the comment gets thousands of likes, shoots to the top of the thread, and suddenly the brand is visible to millions without spending a penny on ads.
Comment marketing became a thing around 2016 when Instagram added the ability to like comments. Before that, comments were just… comments. But once they could be ranked by popularity, suddenly comments under viral posts from brands, celebs, and news outlets weren’t just filler. They were ranked by relevancy and popularity.
This is the new game. You’re not creating content anymore. You’re hijacking someone else’s.
The Duolingo Effect
No one does this better than Duolingo. The language-learning app turned its mascot, a green owl, into an unhinged internet personality that shows up everywhere.
When Zaria Parvez first started Duolingo’s TikTok account, she had never made a TikTok before and didn’t know the first thing about creating video content. Commenting was just easier than filming and editing content. So she focused on what she was good at: writing witty comments.
It worked ridiculously well. Duolingo recreated Duo’s overly pushy personality on TikTok by bombarding comment sections everywhere. Not blatant ads like “download our app.” Just comments that fit the post whilst reminding people the brand exists.
Parvez explicitly states “I am a strong believer that the comment section is your social brief” to gain insight into what resonates with people. Now Duolingo comments on everything. They’ve turned commenting into a replacement for traditional advertising.
Reddit: Where Brands Have to Actually Be Helpful
Reddit is the tricky one. The platform hates advertising. Try to promote your product too obviously and you’ll get downvoted into oblivion. But Reddit is also where people go for honest opinions about products, especially now that Google search results are clogged with sponsored content.
In 2024, Google began prioritising Reddit and Quora links in a new “discussions and forums” section in search results. A Google spokesperson told Business Insider that their research shows users increasingly look for insights from real-world experiences, not just polished content.
Brands have figured out they can’t just drop witty comments on Reddit. They have to actually contribute. That means answering technical questions, sharing behind-the-scenes information, being genuinely useful rather than funny.
Comments across social media platforms including Reddit, wondering why CeraVe had never used actor Michael Cera in its advertising, inspired the creative behind the brand’s 2024 Super Bowl commercial, which featured Cera as its “founder”. The joke had been running for years online before CeraVe finally embraced it.
The Reddit approach is different because the audience is different. People on Reddit can smell marketing from a mile away. The only way in is to be authentic, knowledgeable, and patient. It takes months of genuine participation before anyone trusts you’re not just there to sell stuff.
But the payoff is huge. When Reddit threads show up in Google searches, with real people discussing whether a product is worth buying, brands mentioned positively get instant credibility. That’s worth more than any ad.
The Arms Race of Personality
The problem is everyone’s doing it now. What started as fresh and surprising has become predictable. You check the comments on a viral post and there’s 20 brands saying variations of the same thing with slightly different jokes.
That’s when comment marketing starts feeling less like personality and more like desperation. When 50 companies flood the same moment trying to outdo each other, nobody stands out. It stops being entertaining and becomes exhausting.
When your brand lands a top comment on a viral post, you’re certain to get attention and earn exposure. The ripple effect is real: top comments often lead curious users to your profile, resulting in a measurable spike in profile views, video views, and ideally, followers.
It’s also cheap. Writing 50 comments costs far less than producing 50 videos. The turnaround is faster. The risk is lower. If a comment flops, nobody notices. If it hits, the return is massive.
Wendy’s and the Art of the Roast
Wendy’s social media transformation began in 2017, when the brand shifted from a standard corporate tone to a more engaging and snarky personality. A pivotal moment came when a Twitter user questioned Wendy’s claim of using fresh beef. Rather than responding with a generic corporate statement, Wendy’s fired back with sharp wit.
One of the most famous aspects of Wendy’s Twitter strategy is its no-holds-barred roasts of other fast-food brands, particularly McDonald’s and Burger King. By poking fun at their competitors’ shortcomings (like McDonald’s perpetually broken ice cream machines), Wendy’s turns social media battles into viral marketing opportunities.
In 2018, Wendy’s created their own holiday: National Roast Day on January 4. On this day, anyone from competitors to Twitter users could ask to be roasted. The campaign was so successful that in 2023 Wendy’s took National Roast Day to TikTok, stretching the roasting festivities from a single day to three epic days (April 12-14). The campaign resulted in over 116 million views and reached 30% of the platform’s audience, with Wendy’s gaining 153,900 new followers.
When a Twitter user asked Wendy’s to point her to the nearest McDonald’s, Wendy’s simply responded with an image of a trash can. That one comment encapsulates the entire strategy: brutal, funny, and perfectly timed.
When Comment Hijacking Goes Wrong
On the darker side, when your brand goes viral, competitors show up in your comment section to steal your moment. It’s called brand hijacking and it’s becoming a legitimate problem.
The most famous example is the 2019 chicken sandwich wars. On August 12, 2019, Popeyes introduced a fried chicken sandwich to its menu. On August 19th, Chick-fil-A tweeted “Bun + Chicken + Pickles = all the heart emoji for the original.” Popeyes replied “… y’all good?”
Wendy’s quickly jumped into the debate, saying the two chains were merely arguing over which chain has the “second best” chicken sandwich. Popeyes responded to Wendy’s with “Sounds like someone just ate one of our biscuits. Cause y’all looking thirsty”.
The results? There was a 400 percent increase in Google searches for Popeyes, and a 2,500 percent rise in searches by people who indicated an intent to make a purchase. Foot traffic to Popeyes increased by 54 percent as a result of the feud. However, foot traffic to Chick-fil-A increased by just 5 percent, and visits to Wendy’s fell by about 3 percent.
The lesson? Jumping into someone else’s viral moment doesn’t always pay off. Being the one everyone’s talking about does. Wendy’s tried to hijack Popeyes’ moment and it backfired, whilst Popeyes, who let the frenzy build naturally, saw massive gains.
What This Means for the Rest of Us
Comment sections aren’t neutral spaces anymore. They’re battlegrounds for attention where brands fight to seem human, relatable, and definitely not like brands.
The irony is thick. We’re exhausted by traditional advertising, so brands learned to disguise marketing as conversation. Now we’re getting exhausted by that too. The comments that once felt spontaneous and funny now read as calculated and tryhard.
But the uncomfortable truth remains: it works. Even when you know Duolingo’s social team spent time crafting that comment, it still makes you laugh. Even when you recognise Wendy’s is being snarky for engagement, you still want to see what they’ll say next. Knowing it’s marketing doesn’t stop it from being effective.
CeraVe’s senior vice president says that when consumers are dissatisfied with products, “that’s a perfect opportunity for us” to optimise product description pages or online education around how long consumers should use products before seeing results. Brands are using comment sections not just to market, but to gather intelligence about what customers actually want.
The brands winning this game understand it’s not about being everywhere. It’s about being selective. Skip the fluff. Generic comments don’t work. Each comment is a chance to build stronger connections and position your brand as a relatable voice in the community.
The Future of Selling Without Selling
Comment sections have become what forums and chat rooms used to be: places where culture happens. Brands figured out that if they want to be part of culture, they need to be where the conversation is, not just where they can control the message.
It’s guerrilla marketing for the algorithm age. Cheaper than ads, faster than campaigns, more effective than posts that get buried in timelines. A top comment on a viral video can reach more people than a month of regular content.
But like everything in marketing, the window is closing. As more brands pile in, as users get savvier, as the novelty wears off, comment marketing will need to evolve or die. We’re already seeing the fatigue set in.
The brands that last will be the ones who figure out how to make comments that don’t feel like marketing, even though that’s exactly what they are. The ones who build actual personality rather than performing relatability. The ones who contribute to conversations instead of hijacking them for clicks.
Comment sections became the new marketing channel because that’s where attention lives now. The question is how long before we collectively get tired of brands showing up in our conversations, witty one-liner in hand, asking if we’ve heard about their product yet.
The joke’s getting old. But for now, it’s still working.
