Purpose: This study examines the role of social media marketing (SMM) in promoting new entrepreneurship development in Dindigul District, Tamil Nadu, India. In an era of rapid digital adoption, social media platforms have emerged as cost-effective tools enabling entrepreneurs to enhance brand visibility, engage with customers, and expand market reach. Design/Methodology/Approach: A descriptive survey research design was adopted. Primary data were collected from 120 entrepreneurs operating small and medium enterprises (SMEs) in Dindigul district using structured questionnaires. Percentage analysis and descriptive statistics were employed to analyze the data. The study is grounded in Social Influence Theory (Kelman, 1958), the Technology Acceptance Model (Davis, 1989), and the Resource-Based View (Barney, 1991). Findings: The results reveal that social media marketing significantly contributes to business visibility, customer engagement, and market expansion among new entrepreneurs. WhatsApp (41.7%) emerged as the most preferred platform, and 50% of respondents reported a high impact of SMM on business growth. Furthermore, 54.2% experienced a significant increase in customer reach following social media adoption. Marketing and promotion was identified as the primary purpose of SMM usage (45.8%). Practical Implications: Entrepreneurs in semi-urban and rural districts should integrate digital marketing strategies into their business models. Policy bodies and entrepreneurship development agencies should strengthen digital literacy programs to accelerate SME growth. Originality/Value: This study addresses a significant research gap by focusing on SMM's entrepreneurial impact in a semi-urban South Indian district, an underexplored context in existing literature. It contributes empirical evidence supporting the use of social media as a strategic entrepreneurial resource in emerging economies.