Publicación vertical de anuncio de campaña UGC con prueba social

Create a vertical 9:16 social media post for a modern marketing campaign about user-generated content. Design a clean, scroll-stopping branded graphic that feels contemporary and trustworthy, with a strong headline, supporting subtext, and visual cues of community participation such as creator photos, comment bubbles, review stars, hashtag callouts, and content tiles. Use a polished but approachable brand aesthetic, balanced whitespace, bold typography, and a clear call to action. Include subtle visual references to content moderation, approval, and campaign tracking without showing any real brand logos or interface replicas. Keep the composition optimized for mobile viewing, with high contrast and a clear hierarchy. Negative constraints: no cluttered layouts, no tiny unreadable text, no fake app screenshots, no watermarks, no distorted hands or faces, no copyrighted brand marks.