Annonymous
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I feel that the small box of six is highly dependent on who views your page most in a more recent time period.
The main box of 8 friends, I think is a combination of functions--Interaction obviously has strong weight for a few of the faces. However, one that nobody mentioned, is the Mouse over option. Since, with the addition of the Ticker, you'll find that there's less of a need to actually visit anyone's page anymore, as it's all in the Ticker. I think that FB tracks who's activity you're mousing over from the Ticker--To see who commented on it, liked it, etc. Also from the news feed, there are ways to show interest in a person w/o actually 'liking', 'commenting', or visiting a person's page--I.E, you can mouse over their name to get a bigger picture/summary of them. I strongly believe that FB is tracking these motions heavily and placing weight on them in their algorithms-perhaps stronger weight than public interaction-for these two lists.
So in summary:
Small box of 6 at top: I feel from my observations that the strongest factor at play for that list, is who views your profile most, recently. It seems to randomly pull 6 from a group of the top 24 most recent people who view your profile--Most often, Most recently (As this list recycles more often). At week end or month end, it will reset and randomly and generate a new 24, from which it will randomly pull 6 @ every refresh--I don't think anyone can say they have one person that shows up 100% of the time in that small list, over all of your refreshes in a day...
Larger top 8 (now shows names on pics): This list doesn't switch people very often. The positions seem to be arbitrary with the exception of the lower rightmost picture(Which, from my current guess, has to do with who's paged you've viewed the most over time, with the highest number of views they have on your page simultaneously(mutual stalking). My guess based on my observations, is that each person in this list is there for a different reason, with one thing in common, you've been in pictures with them(if you have 8 separate people that you've been pictured w/ or tagged at a location w/ (As I would assume this is the most concrete way of discerning, progmatically, whether or not you know someone IRL.)) SO--Tagged with, AND have had the most interaction with...probably recently and over time (Each getting a spot.) And the criteria they use to gauge this, is probably everything measurable--Both yours and their: Profile views (I believe this gets most weight) Searches Private messages Mouse overs Picture views
I'm convinced that those who's profiles YOU view most, are a very small part of the function, BY ITSELF--It may very well be a large part of the function if it's combined w/ interaction from those who's pages you're looking at. I say this because I chose one person on my friends list who I really never interact with beside maybe one 'Like" three years ago, and I visited his page, typed his name in search, looked at his pictures, probably 120 times in two days....His profile has never shown in either list.
One more thing, if you've hidden someone's stories completely from your news feed, I am pretty sure no matter how much you two interact, they will be excluded from your top 6 and top 8 lists--Even if they're your biggest stalkers.
Facebook probably tweaks these algorithms often so nobody can prove anything. People would ultimately stop using Facebook to it's full potential if people knew for certain that your crushes know, from which list and where you appear, all sorts of information about how you've been interacting w/ their page. Because lets face it, you could theoretically set up a fake network of about 25-50 profiles, have them all interact with each other in different ways and keep track of ALL of the specific interactions down to the page views. Then you compare those numbers to the faces that show in the top 6 and top 8, and I'm sure you can pin it down to exactly what the algorithm is.
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