I closed my "real" account around 2011. A few months back I created a new blank account because I needed access to a couple organization's pages. The only information on that account is my name (a fairly common one) and an email address which is different from the one on my original account. It's possible they have some geographic info linking the two accounts as I closed and opened them from the same city.
90% of the "people you may know" are correct and from dramatically different social groups. Some how it's picked out a girl I did a family stay with in Germany in '04, a fourth cousin I'm only vaguely aware of, current friends from several groups, and high school friends I haven't talked to in 10 years.