A Privacy International study recently found that 42.55% of free applications on Google Play can share data with Facebook, and many popular applications share data with Facebook once they are opened.
According to research, 61% of applications that test groups automatically transfer data to Facebook when users open the application, regardless of whether the person has a Facebook account or whether they enter the account on the device.
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Some applications send detailed information to social networks that might be considered sensitive. For example, Kayak sends Facebook information about people's flight searches, including their departure city, date and airport and where they plan to go, how long they want to stay, and how many people they travel together. It also shares information about the type of ticket someone is looking for.
Other popular applications determined by this study send data to Facebook including MyFitnessPal, Duolingo, Skyscanner, TripAdvisor, Spotify, Yelp, Shazam, and Indeed.
Facebook has reportedly corrected this problem through a new version of the developer kit, but this application has not implemented it, or at least not implemented it correctly, Engadget report.
This problem does not seem to affect the iOS application version.
You can check the full report for free here. It also creates detailed reports for all applications that send data to Facebook as soon as the application is opened.
If you use one, it's good to know what information you share when you do it.