ALL PHONE NUMBERS of your contacts may be listed on Facebook! To check, go top right corner of the screen, click on ACCOUNT, then EDIT FRIENDS, and on the left side of the screen click CONTACTS; you’ll see all phone numbers from your phone that you have stored in your mobile phone.
TO REMOVE, go to the right column, click on "this page."
Facebook’s remark: "Our Contacts list, formerly called Phonebook, has existed for a long time. The phone numbers listed there were either added by your friends themselves and made visible to you, or you have previously synced your phone contacts with Facebook. Just like on your phone, only you can see these numbers."
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