I wouldn&#x27;t be so sure. I noticed for the first time just a few days ago my phone&#x27;s contacts were showing up on Facebook as suggested friends. These weren&#x27;t facebook profiles, just a name, phone number and the option to email them. I checked all my settings for facebook and messenger apps and all &#x27;sync contacts&#x27; options were disabled and I have never enabled them. I&#x27;m on android. So, my guess is they were somehow granted permissions on installing the app and then the options to disable this actually don&#x27;t do anything. If there was an option upon install to deny access to phone contacts I definitely would have denied it - if they don&#x27;t provide the option to do this on install, they&#x27;re being sneaky.