The researchers who originally pointed out the apparent paradox between personal privacy attitudes and privacy behaviors published a 7-year longitudinal follow-up study, which uncovered that, though Facebook users are sharing less publically, they are disclosing more personal information within their social networks than ever before (Stutzman, Gross et al., 2012). Two of the main reasons they gave for the increased level of in-network sharing were that: (a) Facebook
added third-party apps, which generated additional sharable content on behalf of users and through apps used by one’s friends; and (b) Facebook facilitated “incidental” (Schneier, 2010) sharing of personal information posted by one’s friends through features such as photo and location tagging (Stutzman, Gross et al., 2012). Therefore, we believe that our research is a timely exploration of the privacy implications of Facebook tagging and app engagement with friends.