Design a Feature to Increase User Retention in the First Week

In social apps, the most critical drop-off occurs when users fail to establish a sense of belonging within the first 24 hours, often because they arrive without a network. To address this, I would design a 'Warm Start' onboarding flow that leverages existing graph data. Instead of a generic feed, the app would immediately prompt users to import contacts or scan QR codes from friends, offering a 'Your Circle is Waiting' notification if matches are found. If no direct imports occur, we would deploy a smart recommendation engine suggesting three high-probability connections based on shared interests or location, requiring only one tap to follow. This reduces friction and accelerates the time-to-first-engagement. We would measure success primarily through Day 7 retention rates, specifically comparing cohorts who completed the import versus those who did not. Secondary metrics would include the number of connections made per user and the rate of reciprocal follows. By focusing on immediate social validation, we directly tackle the loneliness factor that causes churn. Finally, we would A/B test different copy variations for the prompt to ensure clarity without being pushy, adhering to Meta's principle of building for humanity.