I don't believe AMEX does a pull on an authorized user since they are not liable for the bill. How much information do you need to fill out on the authorized user? I've added authorized users with just a name with some issuers, but haven't tried on AMEX.

The friend would be better off trying to build credit in his own name through a secured card or something of that nature. I would personally never add a friend as an authorized user of my cards...or if I did I would never actually release the card to that person.

ETA: to add an additional card to my hilton amex it wanted DOB and SSN, but didn't say if they were required or not.