The success of WhatsApp was key to holding on to our values during our transition from 20 million to 1.2 billion users, supported by a unique engineering culture that focuses on simplicity and prioritizes core features over many tasks.

Simplicity through prioritization was key to WhatsApp's success, especially during its acquisition by Facebook for $19 billion.

To stay connected with our users, I personally engage with them on WhatsApp, providing customer support and gathering feedback on new features before launch.

When starting a social app today, I would focus on creating a secure messaging platform as the core, allowing for private and encrypted communication.

The acquisition of WhatsApp was surreal; I struggled to comprehend the magnitude of a billion dollars and what it meant for me personally.

I was the 19th engineer to join WhatsApp, and we had around 20 million users at that time, which grew to 1.2 billion active monthly users by the time I left.

When we co-founded Instagram, we realized that the core of our product was about taking photos and sharing experiences, which led us to strip away distractions and focus on what truly worked.

WhatsApp and Instagram, both small teams at the time of their acquisitions, leveraged Apple's platform to achieve significant growth and impact.

Focus on quality over quantity in your product features. Users prefer great products rather than just a multitude of features.