[slig]

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...

[zevyoura]

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.