This paper presents an empirical investigation to determine the key criteria that viral marketing practitioners believe should be implemented to measure about the success of viral marketing campaigns in insurance industry. The study designs a questionnaire in Likert scale where the effects of four independent variables, personal, message, media and tools characteristics are measured on an Iranian insurance firm’s reputation as well as service expansion. Cronbach alphas were measured for all components of the survey and they were all well above the minimum acceptable level. Using regression analysis, the study has determined positive and meaningful relationships between insurance firm’s reputation as well as service expansion and four independent variables.