I was recently “defriended”, not literally, by someone whom I considered a good enough friend to not have that happen. We were constantly on each other’s walls and private messaging, and we’ve known each other since we were young children. She restricted access to her wall from me. I don’t how many others she did that to, or why. The thing is, if you don’t have access to someone’s wall, then IMHO there’s really not much of a point to being on each other’s friends lists, since the wall is the “heart” of a person’s profile that keeps one up to date on what’s going on in their lives. Basically, I could no longer do much with her profile. So I defriended her. I didn’t announce it to her or tell her why, because I figured that would come across as very childish behavior.