Social Media has invaded all walks of life including the way we consume content. The literature is rich with research on various aspects of social media and its impact on user behavior, organisations, and the society. This systematic literature review has been done to highlight the key themes and methodologies in extant literature for social media and its impact on user behavior. With 61 journal articles as the base of this review, 4 main research themes emerged, namely consumer motivation, effects of the platform format, content type, and the inverse impact of user behavior on the platforms. On exploration of the methodologies used in the relevant literature, a variety of approaches i.e. qualitative, quantitative, mixed, and non-empirical studies have been used to analyze social media usage and its impact on user behavior. Based on the methodological and thematic review, recommendations are provided for future research.