Facebook Uploads Phone Contacts and Logs Phone Calls

Facebook messenger app uploads phone contacts on to their server. To check which phone contacts it has uploaded and delete the phone contacts, click below.

https://www.facebook.com/mobile/messenger/contacts/

1. To stop Facebook manager from auto syncing:
2. Go to Facebook Messanger.
3. Click on your profile picture.
4. Go to People.
5. Set Sync Contacts to Off.

Scarey.