This research examines how social media transcends geographic and cultural boundaries to influence global consumer behavior. Social platforms such as TikTok, Instagram, YouTube, Facebook, WeChat, and Twitter facilitate cultural diffusion, enabling multinational brands to shape preferences beyond national markets. Through conceptual models, case studies, and hypothetical datasets, this study evaluates mechanisms by which cross-border social media content alters perception, lifestyle adoption, and purchasing patterns. Findings indicate that algorithmic content distribution, peer-driven social proof, global influencers, and trend replication significantly affect cross-cultural homogenization and hybridization in consumption patterns. The paper concludes by proposing a cross-border digital influence model and calling for further empirical research in regional socio-cultural moderations.