To optimize X Ads with user-generated content (UGC) and boost social proof, showcase real customers using your product in fun, authentic ways. Feature their photos or videos with captions like, “Our customers are the real MVPs!” or “You + our product = perfection.” UGC feels relatable and builds trust, especially for younger audiences. Encourage viewers to join in by tagging your brand or sharing their own stories. Keep it casual, engaging, and focused on celebrating your community - it’s all about making your audience feel like part of something bigger.