This study aims to analyze the motivations and obstacles that might influence the intention to use social media in online tourism-related purchases and activities. Social media are increasingly present in the everyday life, as not only means for social interaction, but also as marketing tools to various market segments. For the tourism industry, social media are equally important and therefore the study of its adoption and its relevance in consumer decision-making becomes so relevant. The adoption of new technologies can be influenced by several variables such as perceptions of ease of use and utility, trust, privacy and the personal skills of users, among others. In this sense, based on the work presented by Párra-Lopez et al. (2011), a model to evaluate the intention to use social media for online tourism-related tasks is proposed and tested with a survey of 165 individuals. The results, achieved by means of structural equation modeling, confirm all the hypotheses for this research. Direct and significant positive effects of benefits and incentives on the intention to use social media for tourism-related tasks have been verified, while a direct and significant negative relationship between cost and the intention to use social media in online tourism was also found.