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if you have installed the Facebook mobile app your smartphone and, when asked by Facebook, agreed to sync the contacts on your phone with those in your Facebook account, the two lists have merged.
The good news is that you're the only user that can see those numbers. The bad news is that Facebook can, too - and that includes the numbers of people who don't have a Facebook account.
So, according to the NYT, the real losers in all of this are people who have refused to open a Facebook account because they value their privacy and don't want their information collected by the social network - their name and phone number is now in its hands.