The content of the communication were not collected and the identities of the participants’ social contacts were encrypted, so that only the users could get access to them.
Over a period of four weeks, our application collected the metadata of the participants’ communication with their social contacts over four channels, i.e., calls, SMS, e-mails, and Instant Messages (IMs). To this end, we developed an application and conducted a longitudinal field study with 25 participants, who installed our application on their personal smartphones. In this paper, we investigate the information that communication metadata can reveal, specifically, in regards to users’ social circles.
Quite often such policies request users’ consent to ”only” collect their metadata. Privacy policies are one of the key factors that determine user’s privacy exposure.
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