This case study examines the impact of social media technology on the marketing activities of M&S, a leading UK retailer. The study explores how social media has been used to increase brand awareness, customer engagement, and sales. It also analyzes the challenges and opportunities associated with social media marketing for M&S. The research methodology includes both primary and secondary data collection, with a focus on analyzing customer and employee perspectives. The study concludes with recommendations for M&S to further leverage social media for marketing success.