This is an author-produced, peer-reviewed version of this article. © 2009, Elsevier. Licensed under the Creative Commons AttributionNonCommercial-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nc-nd/4.0/). The final, definitive version of this document can be found online at Computers in Human Behavior, doi: 10.1016Behavior, doi: 10. /j.chb.2010 1 NOTICE: This is the author's version of a work accepted for publication by Elsevier. Changes resulting from the publishing process, including peer review, editing, corrections, structural formatting and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The definitive version has been published in Computers in Human Behavior, Volume 26, Issue 6, 2010. DOI: 10.1016/j.chb.2010 One study found that college students reported visiting social network profiles an average of 2.4 to 4.19 times a day for an average of one to two and a half hours Raacke & Bonds-Raacke, 2008).College students report using social networking websites to make new friends, locate old friends and to keep in touch with current friends (Raacke & Bonds-Raacke, 2008). Social network profiles also provide an avenue for identity construction and representation, usually in the form of "showing" rather than "telling" (Zhao, Grasmuch, & Martin, 2008). Despite the positive outcomes of using social networking websites, such as feelings of mastery, identity exploration, and peer group interaction (Hinduja & Patchin, 2007; Schmitt, Dayanim, & Matthias, 2008), online social networking activities can also include less positive activities. Several studies have identified that as many as half of all adolescents and young adults with social networking profiles display negative health risk behaviors, including sexual behaviors and substance use (Moreno, Parks, & Richardson, 2007;Moreno, Parks, Zimmerman, Brito, & Christakis, 2009 found that 85% of young adult's publicly accessible MySpace profiles displayed substance use references.Any number of problems can result from posting images of health risk behaviors including increased risk of cyberbullying, damage to reputation, or loss of educational or vocational opportunities (Barnes, 2009;SkillStorm, 2009; Inside Higher Ed, 2009;Ybarra, et al., 2007). Additionally, the presence of these images may increase peer acceptance and interest in the risk behaviors (Bandura, 2004). Furthermore, a variety of news sources report that police use Facebook, YouTube, and other social-media sites to catch criminals who discuss or upload video recordings of their illegal acts for public viewing (Boston Globe, 2009;Fox News, 2007; New York Times, 2010). Because both photographs and video record an exact representation of real-world events and may be viewed repeatedly, when they are uploaded to a publicly accessible social networking or video-sharing site, images and video footage becomes available to a worldwide audience of Internet users. Risks for access...