A confidential Facebook document reviewed by The Intercept shows that the social network courts carriers, along with phone makers — some 100 different companies in 50 countries — by offering the use of even more surveillance data, pulled straight from your smartphone by Facebook itself.
Offered to select Facebook partners, the data includes not just technical information about Facebook members’ devices and use of Wi-Fi and cellular networks, but also their past locations, interests, and even their social groups. This data is sourced not just from the company’s main iOS and Android apps, but from Instagram and Messenger as well. The data has been used by Facebook partners to assess their standing against competitors, including customers lost to and won from them, but also for more controversial uses like racially targeted ads.
the Facebook mobile app harvests and packages eight different categories of information […] These categories include use of video, demographics, location, use of Wi-Fi and cellular networks, personal interests, device information, and friend homophily, an academic term of art. A 2017 article on social media friendship from the Journal of the Society of Multivariate Experimental Psychology defined “homophily” in this context as “the tendency of nodes to form relations with those who are similar to themselves.” In other words, Facebook is using your phone to not only provide behavioral data about you to cellphone carriers, but about your friends as well.