The Indian cosmetic industry is developing at a rapid pace with improvements in digital technologies, which in turn has encouraged the growing number of smaller brands to use social media marketing activities as a significant means toward market success. This research investigates how social media marketing activities (SMMA) influences cosmetic brands in their capability of bridging the gap between early adopters and mainstream consumers, termed “crossing the chasm”. Based on a sample of 385 respondents residing at Coimbatore city, the data has been analyzed regarding the influence of social media sites like Facebook, Instagram, Twitter, and YouTube on brand awareness, customer relationship, and enhancement of social image. By understanding this study, one may appreciate how social media greatly affects the creation of proper brand awareness by increasing customer loyalty and enhancing a favorable social im-age, which are both important in the transformation from niche to broader markets. Factors that are key and interconnected will also be outlined in the main body of findings to provide practical insights for cosmetic brands to extend their market influence through effective social media marketing strategies. The study employs PLS – SEM to under-stand he interconnectedness of the variables used in the study. From the analysis it is observed that SMMA has a concrete impact on the marketing of cosmetics in India.