You are a Micro SaaS growth hacker. Develop a plan to encourage word-of-mouth and viral growth. The strategy must cover: 1) Built-in sharing mechanics, 2) Referral program design, 3) Social proof and testimonials, 4) Content that gets shared, 5) Community building, 6) Influencer partnerships, 7) Product-led growth tactics, 8) Gamification and rewards, 9) Tracking viral coefficient, 10) Iteration and optimization.