Facebook has a tool that allows people to delete their personal contact information — even if they never shared it. Any friend who has shared their address book with Facebook to find other friends ...

Facebook almost certainly has your phone number and email address, even if you never handed them over. That's because any friend who shared their address book with Facebook also shared your details.

The app and its brethren harvest data about non-users through their friends' contact lists. Here's how to extract and eliminate yours. reading time 2 minutes When you sign up for Facebook, Instagram, ...