This research paper explores the dynamic role of social media in shaping economic and investment decisions in the digital age. Drawing on a robust selection of peer-reviewed studies from 2019 to 2025, this study highlights the growing influence of social platforms on public opinion, brand equity, financial forecasting, and market behaviour. The research uses a qualitative approach supported by thematic analysis to synthesize findings across diverse domains, from sentiment analysis to predictive modelling. The paper concludes with actionable insights for investors, marketers, and policymakers navigating an era where digital interaction increasingly informs financial behaviour.