This study examines the role and impact of celebrity endorsed social marketing and its ability to create behavioural change, from an Indian-expatriate perspective. It concludes that not only are celebrities perceived as enablers of social change, but also that the younger generation of Indian expatriates believe this to be one of the core responsibilities of these personalities. In line with extant literature, the study finds that celebrities have a two-fold impact on social marketing: 1) increased awareness of the cause and increased influence over the audience; 2) endorser credibility and source-message congruence, and the lack thereof, respectively enhance or erode campaign effectiveness. The study offers several new insights, including the potential for celebrity attractiveness to weaken social message credibility, and exposure of the 'reverse vampire effect'. Managerial implications suggest first, the need for distinction between social marketing and social media, and second, that source credibility is critical to campaign effectiveness.