You know that little box in the upper right corner where it will suggest people who you might want to be friends with? And sometimes it will provide an explanation for why it is suggesting that person. I just saw a suggestion where it said "you went to University of XXX with this person." But terrible thing is that I have seen quite a few suggestions for people who I know, but who aren't friends of any of my Facebook friends . And Facebook doesn't explain why it is suggesting them. That is scary, how does Facebook know that I know those people?