A smile flashed across his face when Meta’s lead attorney, Mark Hansen, asked if he was “happy” with the $19 billion he paid for WhatsApp in 2014. Hansen showed the courtroom a deck prepared for Meta’s board around the time of the acquisition, which projected that WhatsApp could reach 2 billion users by 2024. The app has nearly 3 billion users now, Zuckerberg testifies. He says monetization is early but expects AI to accelerate the company’s business of charging brands to interact with their customers via WhatsApp.