I burned $12,000 on ads and got nothing. Here's what I learned.
I thought I had it all figured out. My first company, MovieLaLa, was getting some buzz. We had a decent product, a small but dedicated user base, and a bit of funding in the bank. So, naturally, I thought it was time to pour some gasoline on the fire. We decided to spend $12,000 on Facebook ads to kickstart our growth. The result? Crickets. Nothing. We lit a pile of money on fire and got a handful of worthless vanity metrics in return.
That failure was a punch to the gut. It forced me to question everything I thought I knew about marketing. It sent me down a rabbit hole of trying to understand what actually makes a product grow. It wasn't about ad spend. It wasn't about chasing the latest marketing fads. It was about building something that people genuinely wanted to share. It was about engineering virality into the product itself.
Since then, I’ve been obsessed with growth. I’ve built another company, RemoteTeam, that was acquired by Gusto. I’ve invested in over 200 startups, including some of the fastest-growing companies in the world like Anthropic, OpenAI, and Scale AI. And I’ve seen the same mistakes being made over and over again by founders who are trying to achieve viral growth. They chase silver bullets and ignore the fundamentals.
I’m writing this to save you the $12,000 I burned. And the years of frustration that followed. Here are the 11 most common viral marketing mistakes I see founders make, and how you can avoid them.
1. You're Chasing Tactics, Not Building a System
So many founders I talk to are obsessed with the what but not the why. They ask me, "Should I be on TikTok? Is email marketing dead? What's the best growth hack right now?" They're chasing shiny objects. That's what I was doing with those Facebook ads. I was just copying what other people were doing without a real strategy.
Viral marketing isn't a collection of tactics. It's a system. It's a loop. The core of it is the viral loop, which has three parts: See, Click, Convert. A user sees your product, they click on a link or an invite, and they convert into a new user. That new user then invites more users, and the loop repeats. Your job is to make that loop as efficient and fast as possible. Stop looking for the magic bullet. Start mapping out your viral loop and optimizing each step.
2. You Don't Know Your K-Factor
This is the one metric that matters for viral growth. Your K-factor is the number of new users that each existing user brings in. If your K-factor is 1, you have true virality. For every user you acquire, they bring in one more. If it's less than 1, your growth will eventually flatline. If it's greater than 1, you have exponential growth.
When I was at MovieLaLa, we didn't even know what our K-factor was. We were just throwing things at the wall and hoping something would stick. Once we started measuring it, everything changed. We could see which features were driving the most invites. We could A/B test different incentives and see how they impacted our K-factor. You can't improve what you don't measure. So, before you spend another dollar on marketing, figure out your K-factor. It's your north star.
3. You're Pouring Water into a Leaky Bucket
This is probably the most common mistake I see. Founders are so focused on getting new users that they forget to keep the ones they already have. They're pouring water into a leaky bucket. You can have the best viral loop in the world, but if your users are churning out as fast as they're coming in, you're not going to grow.
Before you even think about virality, you need to have a product that people love. A product that they stick around for. Your retention curve should flatten out over time. If it doesn't, you have a leaky bucket. Go fix the leaks. Talk to your users. Figure out why they're leaving. Make your product better. Only then should you start thinking about how to get more users.
4. Your Incentive Structure is Weak (or Non-Existent)
Let's be honest. People are busy. They're not going to go out of their way to tell their friends about your product unless there's something in it for them. It doesn't have to be a huge incentive. Dropbox famously gave users extra storage space for referring their friends. It was a simple, elegant incentive that was directly tied to the value of the product.
At RemoteTeam, we offered a free month of our service for every new customer a user brought in. It was a win-win. Our users got a discount, and we got a new customer. The key is to find an incentive that is both valuable to your users and sustainable for your business. Don't just offer a generic Amazon gift card. Find something that reinforces the value of your product and encourages users to stick around.
5. You're Making It Too Hard for Users to Share
This seems obvious, but you'd be surprised how many companies get this wrong. I've seen products where the share button is buried three menus deep. Or where the invite flow is a clunky, multi-step process. Every extra click, every extra form field, is a point of friction that will reduce your conversion rate.
Your sharing flow should be as seamless as possible. Pre-populate the invite message. Let users share to multiple channels with a single click. Use social logins to make it easy for new users to sign up. When we were building MovieLaLa, we spent weeks optimizing our invite flow. We A/B tested everything from the color of the share button to the copy in the invite message. It was tedious work, but it paid off. We were able to increase our K-factor by 30% just by reducing friction in our sharing flow.
6. You're Not Using Social Proof Effectively
People are more likely to do something if they see other people doing it. That's social proof. It's one of the most powerful psychological principles in marketing. And yet, so many founders fail to use it effectively.
Don't just tell people that your product is great. Show them. Display testimonials from happy customers. Show how many people are using your product. When a user invites their friends, show them which of their friends are already using your product. This is something that Facebook and LinkedIn do incredibly well. They show you a list of your friends who are already on the platform, which makes you much more likely to sign up. At Scale AI, one of my portfolio companies, they showcase the logos of their impressive customers. That immediately builds credibility and trust. You need to be doing the same.
7. You're Ignoring the Power of Story
Facts tell, but stories sell. I’ve seen this play out dozens of times. A founder will have a great product, but they can't articulate why it matters. They talk about features and specs, but they don't tell a story. People don't buy what you do, they buy why you do it.
What's your origin story? Why did you start this company? What was the problem that you were so obsessed with that you had to build a solution? That's the story that will connect with people on an emotional level. That's the story that they will remember and repeat. When I talk about burning $12,000 on ads, that's not just a random anecdote. It's the origin story of my obsession with growth. It's a story of failure and redemption. And it's a story that resonates with other founders who have made similar mistakes.
8. You're Not Building a Community
A viral loop is a great start. But if you really want to build a sustainable, long-term business, you need to build a community around your product. A place where your users can connect with each other, share best practices, and feel like they're part of something bigger than themselves.
Hugging Face, another company I’m lucky to be an investor in, has done an incredible job of this. They've built a massive community of developers who are all passionate about machine learning. They contribute models, share code, and help each other out. That community is their biggest moat. It's what makes Hugging Face so defensible. Even if someone were to build a better model-sharing platform, they wouldn't be able to replicate the community that Hugging Face has built over years.
9. You're Not Patient Enough
Viral growth doesn't happen overnight. It's a slow, iterative process. You need to be constantly experimenting, learning, and refining your approach. There will be times when you feel like you're not making any progress. There will be times when you want to give up. That's normal.
The founders who succeed are the ones who are patient. The ones who are in it for the long haul. They understand that building a great company is a marathon, not a sprint. They're not looking for quick wins or silver bullets. They're focused on building a solid foundation, one brick at a time. So be patient. Trust the process. And don't give up.
10. You Aren't Thinking About the "Aha!" Moment
What is the one thing that makes a user truly get your product? The moment where they say, "Aha! I see why this is so useful." For Facebook, it was seeing a friend's profile. For Dropbox, it was seeing a file magically appear on another device. That's the "Aha!" moment. And your entire viral loop should be designed to get users to that moment as quickly as possible.
When a new user signs up for your product, what do they see? A blank slate? An empty dashboard? Or do they see a personalized experience that is tailored to their needs? When we were building RemoteTeam, we realized that the "Aha!" moment was when a user saw their team's vacation days automatically tracked and managed. So, we redesigned our onboarding flow to get users to that moment as quickly as possible. We even pre-populated their account with sample data so they could see the value of the product right away.
11. You're Ignoring the Outliers
In any viral system, you're going to have outliers. A small percentage of your users who are driving a disproportionate amount of your growth. These are your super-fans. Your evangelists. The people who are telling everyone they know about your product.
Most founders ignore these users. They treat them the same as everyone else. That's a huge mistake. You should be identifying these users and treating them like gold. Reach out to them personally. Ask for their feedback. Give them early access to new features. Make them feel special. These are the users who will help you cross the chasm from early adopters to the mainstream market. They are your most valuable asset. Don't ignore them.
The Real Secret to Growth
There you have it. The 11 mistakes that have cost me, and many other founders, a lot of time and money. The common thread here is that there are no shortcuts. Viral growth isn't about a clever hack or a secret tactic. It's about a relentless focus on the fundamentals: building a great product, understanding your users, and creating a system that encourages them to share it with others.
That $12,000 I burned on Facebook ads was the best money I ever spent. It was an expensive lesson, but it taught me that you can't buy growth. You have to earn it. You have to build it into the DNA of your product. So, stop chasing the shiny objects. Stop looking for the easy way out. Start doing the hard work of building a product that people love, and a system that helps them spread the word. That's the real secret to viral growth.
Frequently Asked Questions
Are these recommendations still relevant in 2026?
Absolutely. While specific tools and tactics change, the underlying principles remain consistent. I update my thinking regularly based on what I'm seeing in the market and across my portfolio companies.
Can I implement all of these at once?
I'd strongly recommend against it. Pick the 2-3 items that resonate most with your current situation and focus there. Trying to do everything simultaneously is a recipe for doing nothing well.
Which item on this list has the highest impact?
It depends on your stage and context, but in my experience, the items near the top of the list tend to have the broadest applicability. That said, sometimes the less obvious items create the biggest breakthroughs for specific situations.