Every entry in Contacts.app that has an email address or phone number (doesn't matter if the phone number is mobile or not) has a "FaceTime" entry as well. Seems a bit misleading since clearly not all numbers/email addresses are FaceTime-capable. Perhaps it's just a bug; if not, I can see technically unsavvy (i.e. parents) trying to FT anyone in their contacts and wondering why the call isn't going through...
