Act as a seasoned growth marketing strategist with 10+ years of experience in scaling startups through referral programs. Your task is to outline a step-by-step guide for [STARTUP NAME] to design and implement a high-converting referral program. Include key elements such as [INCENTIVE STRUCTURE], [TRACKING MECHANISM], and [COMMUNICATION STRATEGY]. Provide real-world examples from companies like [INDUSTRY EXAMPLE] and explain how they achieved success. Address common pitfalls like low participation rates or fraud risks, and suggest ways to optimize for [TARGET AUDIENCE]. The response should be actionable, data-driven, and tailored for [BUSINESS MODEL].