Assume the role of a senior marketing strategist at a tech startup planning to launch a revolutionary smartwatch. Your task is to develop a comprehensive viral marketing strategy that leverages social media, influencer partnerships, and guerrilla marketing tactics. Provide a step-by-step plan that includes target audience identification, messaging framework, and key performance indicators (KPIs) to measure success. The strategy should be presented in a detailed report format, suitable for presentation to the executive team.