Social commerce integrates social networking interactions with digital purchasing behaviors, transforming how consumers discover, evaluate, and buy products across global markets. Unlike traditional e-commerce, social commerce relies on community endorsements, influencer credibility, in-app transactions, and algorithmic personalisation. However, behavior varies significantly across cultural, economic, and regulatory contexts. This study synthesizes research from digital commerce, consumer psychology, cultural economics, and platform governance to propose the Cross-Country Social Commerce Behavior Framework (CCSCBF). The framework identifies five behavioral drivers: Trust & Social Validation, Cultural Norms, Technological Infrastructure, Platform Ecosystems, and Economic Purchasing Power. Differences across markets such as China, USA, India, Middle East, and ASEAN are analyzed to highlight patterns and strategic implications.