People use social networks to fulfill a variety of social needs, including self-expression and self-presentation (Back et al. 2010; Gosling, Gaddis, and Vazire 2007). Consequently, using a social network can enhance self-esteem and positively affect well-being (Gonzales and Hancock 2011; Valkenburg, Peter, and Schouten 2006). We propose that while social network use does make people feel better about themselves, these increased feelings of self-worth can have a detrimental effect on behavior. We argue that, because people care about the image they present to close friends on social networks, social network use enhances self-esteem in users who are focused on close friends (i.e., strong ties) while browsing their social network. This momentary increase in self-esteem reduces self-control, leading those focused on strong ties to display less self-control after browsing a social network compared to not browsing a social network.