examined 34 Android apps, each with an install base from 10 to 500 million, and found they transmitted data through the SDK to Facebook. Data shared with Facebook varies by app. Kayak, for example, sends Facebook all search data conducted through its app, according to researchers. A King James Bible app shared the passage and verse viewed by the app user.
Researchers said the majority of apps share data such as the fact the app is used, when the app is opened and closed, the Android device being used and the user’s inferred location based on language and time zone settings, according to researchers.Part of the sensitive data shared with Facebook is the use of the app itself. For example, apps sharing data include a women’s period tracker, prayer apps, job search apps and apps appropriate for young children. Other data found shared by apps via the Facebook SDK is something called “user ratings”, session IDs and additional data variables.Facebook, Privacy International points out, is just one of hundreds of so-called tracking companies that collect data that is used by online marketing firms that cull user information together to create massive digital dossiers on users. Facebook is the second largest of such tracking companies on the internet after Google.https://threatpost.com/how-facebooks-tracks-non-users-via-android-apps/1404