Antecedents: Motivation for using social networks helps to understand the online behaviors of the adult population and can be a relevant predictor of several variables, considering its common usage on a daily routine. Objective: This article aimed to seek evidence of validity and accuracy for the Social Media Motivations Scale (SMM-S) in the Brazilian context and understand its relationship with personality and life satisfaction. Method: The research was carried out in two stages, with 600 adults in each one, users of online social networks. In both samples, most were women with higher education, from all Brazilian regions and pointed Instagram as their favorite online service. Results: Results indicated that the adapted version of the Social Media Motivations Scale presented indicators of validity and reliability for a structure of four dimensions: Freedom in Social Networks, Routine in...