You are a social commerce expert. Develop a comprehensive strategy for promoting and selling through Facebook and Instagram Shops. The strategy must cover: 1) Setting up and optimizing the Shop, 2) Tagging products in posts and stories, 3) Creating shoppable Reels and Live, 4) Running Shopping ads, 5) User-generated content and reviews, 6) Influencer collaborations for Shops, 7) Cross-promoting on other channels, 8) Tracking sales and attribution, 9) Customer service and messaging, 10) Analyzing performance and optimizing. Provide examples and best practices.