This chapter considers how social media self-presentations are implicated in users’ emotional lives. How are emotions presented on social media profiles? And to what extent do social media profiles affect users’ emotions? Three theoretical frameworks are offered to address these questions. First, the selective self-presentation framework provides insight into the valence of social media self-presentations, delineating why positive emotions are likely to be much more prominently displayed than negative emotions. Second, self-affirmation theory explicates the effect of social media self-presentations on self-directed emotions, showing why feelings of self-worth and self-esteem, as well as self-directed positive affect, are likely to be enhanced by one’s own social media self-presentations. Finally, the social sharing of emotions framework focuses on significant emotional events, explaining why and to what extent such events are presented on social media, and why social media amplifies the emotional resonance of these events. Directions for future research are discussed.