Chapter 11 Liking, Creeping, and Password Sharing: Romantic Jealousy Experience and Expression and Social Networking Sites Jennifer L. Bevan Romantic jealousy is a cognitive, emotional, and/or behavioral/communicative response to the need to protect and defend a romantic relationship from the threat of a perceived (possibly actual) rival (Bevan 2013). As the number and usage of social networking sites (SNSs) have exponentially grown in the last decade, romantic jealousy experience and expression has accordingly migrated into this increasingly influential communication context. Specifically, romantic jealousy can arise in response to partner or rival behaviors on Facebook (e.g., Muise, Christofides, and Desmarais 2009) or Snapchat (Utz, Muscanell, and Khalid 2015) and is often indirectly expressed by engaging in surveillance (e.g., Tokunaga 2011, 2014). Indeed, 27% of teens who have relationship experience say that social media has made them feel jealous or uncertain about the relationship, typically via posts and photographs (Lenhart, Smith, and Anderson 2015). It is thus not surprising that jealousy consistently emerges as a primary Facebook stressor across age groups and cultures (Baker and Carreño 2016; Fox and Moreland 2015; Rueda, Lindsay, and Williams 2015; Van Ouystel et al. 2016). A comprehensive review of research examining jealousy in mediated contexts, including SNSs, was last undertaken by Bevan (2013). Since then, this body of scholarship has grown in volume and significance, now encompassing such important topics as intimate partner violence. Thus, based on the ever-increasing growth and influence of SNSs, their consistent associations