If you unfriend someone, it simply removes then from your friends list/their friends list with no notification to the person.
I do not know of any way to get notified.
I also think that the unfriend option, doesnt show you on their friends list, but am not much of a facebook user. I mainly use it to wish people on their birthdays or genenral occasions.
Once in a while, I'll check out the photos of them posted on my wall.
I think probably they might have enabled the privacy option to see who views what they post, but am not sure of facebook and all of its features.
Still facebook is very popular among a lot of people, that its become a marketing platform for a lot of companies.
I've also seen malware on it from some people's posts there as well.
Well, if someone "unfriends" you, its nothing to be really bothered about, as long as you are happy with yourself, and the real friends you have in life, instead of facebook.
Alright, I'll say it.
If a person can suddenly and without warning vanish from your social sphere and the only reason you even notice anything strange has happened is because your group seems a little bit smaller ... maybe, just maybe, that's not what a friend is.
The English language needs a new word here.