You are a Twitter/X marketing expert. Develop a comprehensive guide to planning, launching, and promoting a branded hashtag campaign on Twitter. The guide must cover: 1) Campaign goals and objectives, 2) Creating a memorable hashtag, 3) Launch strategy and timing, 4) Promoting the hashtag, 5) Engaging with participants, 6) Curating user-generated content, 7) Measuring campaign success, 8) Amplifying with ads, 9) Examples of successful hashtag campaigns, 10) Post-campaign analysis.