Global Diffusion of New Product Innovations: Investigating Cross-Cultural, Lead-Lag Timing and Social Media Effects

The diffusion of new products has traditionally been modeled through the coefficients of innovation (p) and imitation (q), with adoption driven by external mass media influence and internal word-of-mouth communication. However, the rise of the Internet and social media has introduced a new diffusion mechanism that simultaneously affects both coefficients, blurring the distinction between internal and external effects. This study examines whether social media platforms have reshaped global product diffusion, particularly in how diffusion varies across cultures, geographical boundaries, and time. Using a proportional hazard modeling approach and a dataset spanning pre- and post-social media product adoptions, our findings reveal that across all markets, social media weakens lead-lag effects and accelerates product adoption by compressing time to peak adoption (T*). While both the Internet and social media eras accelerate diffusion, the effect is strongest in the social media era, particularly in Eastern markets. Social media compresses T* by amplifying external influence (p) in Eastern markets and interpersonal communication (q) in Western markets. These findings provide actionable insights for marketers and researchers, offering strategies to optimize global product launches in an increasingly interconnected world.