On WLIB we have many ways to communicate - guestbook, private messages and now also wall (recent activity). When we created the wall, we realized that the guestbook is no longer needed. One private and one public communication channel is what's needed.
So we decided to remove the guestbook from the profile navigation, but you can still access it via this link, and if you have any unread guestbook messages, you'll be able to access them by clicking Notification > Guestbook from the top menu
If anyone have any concerns about this, let's hear it here. Hopefully most of you share the opinion for the removal.