The document presents social media marketing case studies, notably for the film '3' and the brand Skoda, outlining successful promotional strategies and contrasting them with negative repercussions experienced by Skoda due to consumer dissatisfaction. It highlights how viral marketing, particularly through the song 'Why This Kolaveri Di', captured significant attention across platforms, while Skoda's attempts to suppress criticism backfired, leading to substantial negative publicity. Additionally, Aircel's innovative marketing during a flooding incident showcased effective brand engagement through real-time response, garnering positive media attention and establishing a supportive brand image.