By all means feel free just to chat in the guestbook - as long as it's not spam!
Anybody with Admin below their name is definitely me or a trusted person. I myself will always sign as Butterfree. If somebody signs under that name but does not have the Admin label, it is most likely an impostor.
Commenting on: 07-14-17
I was actually wondering why you didn't do this earlier to be honest. But I'm glad you did now. :)