  The emergence of online social networks and the growing popularity of digital
communication has resulted in an increasingly amount of information about
individuals available on the Internet. Social network users are given the
freedom to create complex digital identities, and enrich them with truthful or
even fake personal information. However, this freedom has led to serious
security and privacy incidents, due to the role users' identities play in
establishing social and privacy settings.
  In this paper, we take a step toward a better understanding of online
information exposure. Based on the detailed analysis of a sample of real-world
data, we develop a deception model for online users. The model uses a game
theoretic approach to characterizing a user's willingness to release, withhold
or lie about information depending on the behavior of individuals within the
user's circle of friends. In the model, we take into account both the
heterogeneous nature of users and their different attitudes, as well as the
different types of information they may expose online.
