I have only read the first few posts but this is my immediate response:
(it's boring, but it might be relevant)
Once, about a year ago, I met a new friend who added me as a friend to fb. She kept mentioning another friend who lived near me and as I live in a very tight-knit expat community I was curious to see if I knew this woman. So I clicked on her profile via my friend's fb page, to get a close up look at her photo. Nope, never seen her before, and have never met her, have never looked at her profile since.
The weird thing is though, that her name and a link to her fb page keeps popping up right up there ^ next to my search bar, in my history, STILL almost a year later, along with MN which seems to live omnipresently in my computer . I clear my history regularly, and I regularly use several sites other than MN, and I regularly spy on at several fb pages who are not in my frineds group, but for some bizarre reason that I do not understand, only MN and this woman who I do not know and have no further interest in, are the only regular, long-term popper-uppers, and I don't know why, or how to get rid of her.
He may be telling the truth.