This layout, which I keep meaning to remake has a lot of stuff you could include in the about tab you could snag. There's stuff about the player I've decided most people use going through random CDJs: timezone, interests, etc. I also love seeing activity logs (linked activity and for what characters at what games) because I'm nosey. Apart from that, I've got nothin'. I think CDJs aren't really used enough (or are also used as journals so much) for there to be specific standards about them.