ALL THE PHONE NUMBERS IN YOUR PHONE are now on facebook! go to the top right of the screen, click on ACCOUNT, click on EDIT FRIENDS, left side of screen and click CONTACTS. you will see all phone numbers from your phone (FB friends or not) are published that you have stored in your mobile phone. TO REMOVE, go to RIGHT column, click on “this page.” please repost this on your status, so your friends can remove their numbers and thus prevent abuse if they do not want them published.
UPDATE – read this too: http://techieminx.com/facebook-phonebook-are-my-contact-numbers-on-show.html