Focus areas: Social products, news feed, messaging, real-time systems, content delivery.
What they value: Product intuition, user experience thinking, handling viral content, graph relationships.
Common topics: Design Facebook feed, design Instagram stories, design WhatsApp, design a live streaming system.
Tips: Think about product implications. "This feature improves engagement because..." Show understanding of social dynamics (viral spread, privacy). Meta wants engineers who understand why, not just how.