There was confusion about that yesterday....when they first split the line into two, the UC security staff said you could only enter the U2.com line if your ticket said "Fan." But once we actually got up there, they said if you had your profile page printed out from U2.com, you could have gotten into that line. Which pissed off a lot of us (myself included) because they didn't say that right from the start.
So, the answer is...I don't have one. If you have proof that you are a U2.com member, you should be able to get into the fan line, but it all depends on what they do on that actual day. My advice is to ask lots of questions when they split the line, and make sure you are in the right one BEFORE they start letting you into the UC.