I received a message from Dan and hit reply. The reply was posted on my wall when I wanted to post on Dan's. Therefore I wanted to delete the reply I made on my own messaging board but when I hit delete it also deleted Dan's message. I thought it might be better to just have it delete what you posted as opposed to deleting what you and your friend posted. Just a random suggestion...
Re: Messaging
I agree that the post/reply system for the guestbook/wall is counter to how sites like MySpace or Facebook work. We are looking further at the guestbooking stuff right now.