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

The 'one employee unicorn' concept suggests that with the right infrastructure and AI, a single employee can build a large company.

In the future, we could see unicorns, or billion-dollar companies, operating with as few as ten employees, as AI technology advances.

Over the last decade, the number of unicorns has increased due to advancements in technology that make it easier for people to launch their ideas.

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.

In the mobile era, Apple was ahead while Facebook struggled to keep up, often acquiring companies like Instagram and WhatsApp to strengthen its position.

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

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.

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