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Complexly

by Hank Green, John GreenLaunched 2007via How I Built This
Contentviralown-pain
See all Content companies using viral
Growthviral
The Spark

In 2007, brothers Hank and John Green faced a common problem: they lived thousands of miles apart and wanted to stay connected. Rather than relying on traditional phone calls or emails, they decided to start posting video blogs to each other on YouTube, a platform that was still relatively new and strange to most people.

Finding the First Customers

What started as a private communication method between brothers quickly caught the attention of YouTube viewers. The daily Vlogbrothers posts resonated with audiences and became an early viral hit on the platform, growing organically as people tuned in to watch their content. The brothers didn't aggressively market or pitch—the content itself drove discovery and engagement.

What Worked (and What Didn't)

The viral success of Vlogbrothers validated their core insight: there was significant demand for educational, entertaining video content. Hank Green has articulated his philosophy for growth: "What's exciting? What's causing you the most stress? Head in that direction." This approach guided their expansion beyond the original channel.

Where They Are Now

Over time, the single video channel evolved into Complexly, a full-scale production studio creating some of the most entertaining educational content on the internet. The brothers have also become hugely successful authors—John's young adult novel The Fault in Our Stars is one of the best-selling books of all time. The business has grown into a sprawling collection of ventures spanning video production, publishing, and educational media, all built on the foundation of that initial viral success.

Why It Worked
  • Solving a genuine personal problem (long-distance connection) created authentic content that resonated authentically with audiences because the creators were solving a real need they understood deeply.
  • Early adoption of an emerging platform (YouTube in 2007) with native video-first content gave them first-mover advantage and organic discovery before algorithmic competition intensified.
  • The founders' willingness to pursue what excited and stressed them most enabled continuous expansion into new formats and verticals (video, books, education) without losing the core audience that trusted their taste.
  • Organic viral growth through content quality eliminated customer acquisition costs and created a self-selecting audience already aligned with the creators' values and interests.
How to Replicate
  • 1.Identify a meaningful personal problem you or your team experiences that likely affects others, then build your initial product or content as a solution to that specific pain point.
  • 2.Launch on an emerging platform where content distribution is still driven by quality and novelty rather than entrenched algorithmic preferences, prioritizing native format alignment over cross-platform repurposing.
  • 3.Create a decision-making framework around what genuinely excites your team and causes productive stress, using that as your north star for which new projects or verticals to pursue rather than chasing market trends.
  • 4.Resist the urge to aggressively market early traction; instead, invest heavily in content quality and consistency, allowing word-of-mouth and platform algorithms to drive discovery before scaling paid acquisition.

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