Yeah, I think it is a built in app which is why it's shown with all the other built in apps on the screenshot. Unlike other Apple apps like Find My Friends which do not show up in stock images of iOS.Sorry if this is obvious but am I right in thinking that Passbook is a built in App such as Stocks, Weather etc, not like Cards and Find My Friends? Just wondering because I don't think I would find much use for Passbook personally.
You can remove the YouTube icon by going to Settings>General>Restrictions and setting YouTube to Off.Super nice to see that the YouTube icon still looks like crap and the app hasn't been updated yet. I wish Apple would either a) update it b) remove it or c) let me remove it. <insert jailbreak comment here>