Acton reinforces a notion we’ve heard about the WhatsApp founders throughout trial: that they had absolutely no interest in building an ad-supported product or a social media feed. He testifies he wanted to focus on building the communications product and limiting distractions. “We had no ambition to build Facebook-like functionality like a feed,” he testifies. That’s why he wrote this infamous note in the early days of WhatsApp as a reminder of its guiding principles.