Copywriting is persuasive writing used to encourage actions like liking, following, or purchasing. For social media, copywriting should follow formulas like PAS (Problem, Agitate, Solve) and UUUU (Useful, Urgent, Unique, Ultra-specific). On Facebook, write short, multimedia posts focusing on value with a clear call-to-action. On Instagram, highlight products and benefits, engage users with questions, and optimize hashtags and mentions. Instagram Stories are for elaborating on features, benefits, product use through examples, and linking to additional information. The goal is to clearly communicate value and make purchasing easy across all platforms.