That they track where you've been on FB should be obvious. How they do it is interesting.
I have searched for old friends who are not on FB, but found people with the same or similar names. Visiting their profiles, I found them not to be whom I thought.
But FB continued to suggest those people as friends -- still do after many months of ignoring the suggestion.
FB's records also are obvious in their default "Top" news presentation on your own wall. Those people you visit most are featured there. You have to select "Most Recent" in order to get everyone, including those you don't visit or post to, but would like to hear what they are doing.
Yes, FB keeps track of profiles visited. For me, it's an annoyance and messes up what I would rather be seeing. Actually, I haven't been there for a while, so it may have changed, like their fluid privacy settings.
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