Facebook Still Tracks People on Yelp, Duolingo, Indeed

As it stands, the Facebook SDK is designed to automatically transmit personal data to Facebook the moment a user opens the app. Many apps we tested, including those that no longer send data to Facebook, still send a shocking amount of personal data to all sorts of third parties, like advertisers or data brokers, in ways that are not transparent and don’t give users a genuine choice. Individual donations are incredibly important to us, and allow us to fund work like this

[1] We found an example of a Muslim prayer app using the SDK version 4.38.0 that disabled app_events_auto_logging and still sent users’ Google advertising ID immediately after the app was opened.This suggests that apps that used the SDK were unable to deactivate the automated sending of data even if they deactivated it up until October 23, 2018 (the day that the SDK was updated

Source: privacyinternational.org