Want to know who have deleted you or deactivated their profile, now you can do so. You just need to install greasemonkey script for firefox ( it supports all browsers ) and install a unfriend finder script and you are done. For more info please visit Unfriend Finder
I'm wondering why worry about who unfriend you. It's not important if someone don't like the content you display or what you're all about because they're going to like you or not either way.
Yeah, I agree why bother to know who unfriend you? People don't really spend much time knowing who's missing in their friend's list instead they are busy befriending people whom they think can be beneficial to them.
yes, quite true, why worry and bother about who has unfriend ? Instead focus on befriending more people of your interest & likes.