A teardown of Facebook's user data archive has revealed the fact that the company collects private user data including well-detailed call logs and text metadata. The company has been involved in a number of cases pertaining to privacy issues, and this is just another icing on the cake.
https://www.notebookcheck.net/Facebook-has-been-swiping-call-and-text-data-from-Android-users-for-years.291254.0.html