Users today access a multitude of online services---among the most popular of which are online social networks (OSNs)---via both web sites and dedicated mobile applications (apps), using a range of devices (traditional PCs, tablets, and smartphones) that are connected via a variety of networks. The resulting infrastructure makes these services conveniently available anytime and anywhere, enabling them to become an integral part of daily life. As a consequence, users explicitly and implicitly provide a wealth of Personal Information (PI) that reflects several aspects of their life. Service providers monetize this information by selling to third parties (e.g., advertisers). Unfortunately, today, it remains difficult for end users to fully understand the amount and nature of the collected data.
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Liu et al. (2015) studied this question.
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