TikTok has evolved from an entertainment platform to a global commerce ecosystem integrating algorithmic product discovery, live-stream sales, short-form content marketing, and in-app purchases. Adoption patterns vary across cultural, economic, and regulatory contexts, creating unique regional strategies for brands. This study examines cross-market adoption of TikTok commerce using theoretical frameworks, cultural analysis, and hypothetical datasets. Findings show Asia leads in live-commerce maturity while Western markets adopt TikTok for influencer-driven product discovery rather than direct purchase. A cross-market diffusion model is proposed to illustrate how cultural norms, platform regulation, and digital payment ecosystems shape adoption.