Lecture 6: Growth with Alex Schultz

What this lecture covers

This lecture asks what actually drives startup growth, and argues the answer is retention, not virality or growth hacking. Alex Schultz, VP of Growth at Facebook, draws on his time there and at eBay to show how to measure retention with a cohort curve, how to find the "magic moment" that gets users hooked, and how to organize a company around a single north star metric.

It sits alongside other growth-focused lectures in the course and follows on from earlier talks on product and team. After watching, you should be able to build a basic retention curve for a product, identify what its magic moment might be, and evaluate viral mechanics using payload, frequency, and conversion rate.

Key ideas

• Retention curve: plotting the percentage of users still monthly active by day since signup; if it flattens into a line parallel to the x-axis, the product has product-market fit.
• North star metric: a single company-wide number (monthly active users, sends, nights booked, gross merchandise volume) that every team optimizes toward, set by the CEO.
• Magic moment: the specific action that gets a user hooked, such as seeing a friend's face on Facebook or finding the right item on eBay; growth work should get users there faster.
• Marginal user: growth decisions should be judged by their effect on the person who barely uses the product, not on power users.
• K factor and virality: a product's viral strength can be broken into payload (how many people you reach), frequency (how often), and conversion rate.
• Barrier-knocking: growth often comes from removing a structural barrier, such as internationalization or opening signups beyond a limited group.
• Deliverability first: for email, SMS, and push notifications, getting messages delivered matters before optimizing open or click rates.

Walkthrough

Retention as the foundation of growth (0:00)

Schultz opens with his own background in SEO and online marketing before turning to the core claim: retention, not acquisition or virality, is what determines whether a startup will grow. He explains the cohort retention curve, plotting the percentage of users active by days since signup, and shows that a curve which flattens out indicates product-market fit, while one that keeps sloping toward zero does not.

Measuring retention without huge data (4:04)

He describes how Facebook used this method within 90 days of a new advertiser product launching to predict its one-year value to 97% accuracy, and explains that even a company with only a few thousand users can build a usable retention curve by tracking what percentage of users active on day one are still active on day 31, 32, and so on.

What good retention looks like, and operating for growth (9:09)

Rather than giving a universal retention benchmark, Schultz argues you should compare your product to others in the same vertical using rough, back-of-envelope reasoning. He then argues against dedicated growth teams at early startups, saying the whole company should function as the growth team with the CEO setting the north star metric, illustrated with Facebook's monthly active users, WhatsApp's sends, and eBay's gross merchandise volume.

The magic moment and the marginal user (16:14)

He explains that the magic moment is the point where a new user becomes hooked, such as seeing a friend's photo on Facebook, and that companies should design onboarding to reach it as fast as possible. He also argues that growth decisions should be based on the marginal user who barely engages, not on the growth team's own habits, using Facebook's approach to notifications as an example.

Growth tactics: internationalization and virality (22:17)

Schultz shifts to tactics, starting with how Facebook internationalized late and had to build scalable translation infrastructure, prioritizing languages by future growth rather than current distribution. He then covers virality through two lenses: Sean Parker's payload/frequency/conversion framework, illustrated with Hotmail and PayPal, and a funnel view of invites, clicks, and signups that produces the K factor.

SEO, email, and closing thoughts (38:28)

The lecture closes with practical SEO advice on keyword research, earning authoritative links, and internal linking (illustrated by a change that 100x'd Facebook's SEO traffic), followed by guidance on email, SMS, and push: prioritize deliverability, avoid generic newsletters, and favor timely, triggered notifications tied to user behavior.

Before you watch

• Familiarity with basic startup metrics (signups, active users, churn) is helpful.
• No specific earlier lecture is required, though lectures on product and team-building in this course provide useful context for why retention depends on product-market fit.

Check your understanding

1. Why does Schultz argue that a company should focus on retention before investing in virality or growth hacking?
2. How is a cohort retention curve constructed, and what does it mean if it flattens versus keeps sloping toward zero?
3. What is a "magic moment," and how did Facebook identify its own?
4. Using the payload, frequency, and conversion rate framework, explain why Hotmail's email footer was highly viral despite low payload.
5. Why does Schultz recommend against having a dedicated growth team in an early-stage startup?