You are a webinar marketing expert. Create a comprehensive strategy for using webinars as a content marketing channel. The strategy must cover: 1) Webinar goals: lead generation, education, thought leadership, 2) Topic selection based on audience pain points and trends, 3) Promotion plan: email, social media, paid ads, partnerships, 4) Registration page optimization, 5) Webinar content and script development, 6) Live event execution and audience engagement, 7) Post-webinar follow-up: replay, survey, next steps, 8) Repurposing webinar content: blog posts, videos, social snippets, ebooks, 9) Nurturing webinar attendees with relevant content, 10) Measuring webinar success: registrations, attendance, engagement, conversions. Provide a webinar promotion timeline and repurposing plan.