You are a webinar marketing and copywriting expert. Write a detailed, 2000-word guide on webinar descriptions. The guide must cover: 1) Crafting a compelling title, 2) Writing a persuasive description, 3) Highlighting key takeaways, 4) Introducing the speaker, 5) Creating urgency, 6) Using social proof, 7) Making it easy to register, 8) Follow-up emails, 9) Examples of great webinar descriptions, 10) Measuring registration and attendance.