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Re:LinkedIn: The Creepiest Social Network by slig on Thursday May 09, 2013 @12:29PM (#5681296)
Yes, they are. They have an ranked array of your top contacted/stalked friends and they use it to speed up the topbar search.

In fact, there is an bookmarklet that shows the list: http://thekeesh.com/2013/03/updated-facebook-friends-ranking...

Re:LinkedIn: The Creepiest Social Network by zevyoura on Thursday May 09, 2013 @01:59PM (#5681931)
To be clear, it seems that the data exposed in this way is only affected by your own actions; i.e. it does not tell you who has been stalking you, just who you've been stalking.