Act as a seasoned growth hacker with 10+ years of experience in scaling startups. Design a step-by-step viral growth loop strategy for [PRODUCT_NAME], a [PRODUCT_TYPE] targeting [TARGET_AUDIENCE]. Include: 1. Key triggers for user acquisition (e.g., referral incentives, social sharing hooks) 2. Mechanisms to maximize retention (e.g., gamification, personalized onboarding) 3. Metrics to track virality (e.g., K-factor, viral cycle time) Provide 3 real-world examples of successful loops in [INDUSTRY] and explain how to adapt them. Highlight common pitfalls like [COMMON_MISTAKE] and how to avoid them. Format as a 5-phase blueprint with estimated timelines for [LAUNCH_TIMEFRAME].