Act as a seasoned newsletter strategist with 5+ years of experience in audience engagement. Craft a step-by-step guide on how to effectively integrate interactive polls into newsletters to boost engagement and gather insights. Include best practices for [POLL TOPIC SELECTION], [PLATFORM RECOMMENDATIONS], and [ANALYZING RESULTS]. Explain how to frame poll questions to maximize responses, how often to include polls without overwhelming readers, and how to use the data to tailor future content. Provide examples of successful poll-driven campaigns in [INDUSTRY] and highlight common pitfalls to avoid.