Modeling profile-attribute disclosure in online social networks from a game theoretic perspective

Privacy settings are a crucial part of any online social network as users are confronted with determining which and how many profile attributes to disclose. Re­ vealing more attributes increases users’ chances of finding friends and yet leaves users more vulnerable to dangers such as identity theft. In this dissertation, we consider the problem of finding the optimal strategy for the disclosure of user attributes in social networks from a game-theoretic perspective. We model the privacy settings’ dynamics of social networks with three gametheoretic approaches. In a two-user game, each user selects an ideal number of at­ tributes to disclose to each other according to a utility function. We extend this model with a basic evolutionary game to observe how much of their profiles users are comfortable with revealing, and how this changes over time. We then consider a weighted evolutionary game to investigate the influence of attribute importance, benefit, risk and the network topology on the users’ attribute disclosure behavior. The two-user game results show how one user’s privacy settings are influenced by the settings of another user. The basic evolutionary game results show that the higher the motivation to reveal attributes, the longer users take to stabilize their privacy settings. Results from the weighted evolutionary game show that: irrespective of risk, users are more likely to reveal their most important attributes than their least important attributes; when the users’ range of influence is increased, the risk factor plays a smaller role in attribute disclosure; the network topology exhibits a considerable effect on the privacy in an environment with risk. Motivation and risk are identified as important factors in determining how efficiently stability of privacy settings is achieved and what settings users will adopt given different parameters. Additionally, the privacy settings are affected by the network topology and the importance users attach to specific attributes. Our models indicate that users of social networks eventually adopt profile settings that provide the highest possible privacy if there is any risk, despite how high the motivation to reveal attributes is. The provided models and the gained results are particularly important to social network designers and providers because they enable us to understand the influence of different factors on users’ privacy choices. APPROVAL FOR SCHOLARLY DISSEMINATION T he author grants to the P rescott M em orial Library o f Louisiana T ech University the right to reproduce, by appropriate m ethods, upon request, any o r all portions o f this Thesis. It is understood tha t “p roper request” consists o f the agreem ent, on the part o f th e requesting party , tha t said reproduction is fo r his personal use and tha t subsequent reproduction will no t occur w ithout w ritten approval o f the au thor o f this Thesis. Further, any portions o f the Thesis used in books, papers, and o ther w orks m ust be appropriately referenced to th is Thesis. Finally, th e au thor o f this Thesis reserves the right to publish freely, in the literature, a t any tim e, any or all portions o f this Thesis.