This week Facebook users across the nation have been having a heart attack and grabbing their tinfoil hats in horror over what they saw as an almost science-fiction-like Facebook feature they believed to have just crept up on them to grab them in the night: a list of phone numbers. As you may or may not know, Facebook has had your phone number ever since you first entered it in when you signed up for the site. Didn't sign with your phone number in the first place? Did you download a Facebook app of basically any kind on any sort of smartphone in the past? If you did, you agreed to have your mobile phone number shared with all of your friends.