The good news is that this is an opt-in feature, but there's a catch. Each time you install a Facebook app you're asked whether to allow access to your "basic information" and your "current address and mobile phone number," and if you click Allow, the information can be provided. Many people routinely do click Allow without necessarily reading the request for permission or thinking about the implications. The safest way to make sure your address and phone number aren't passed on to developers is to not provide it all, and if it is there in your Facebook profile, to remove it. I especially recommend that parents talk with their teens about removing this information from their profiles.
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