> A lot o folks tend to form networked social communities; statistically, if someone you know knows someone else, the odds are better than even that you know that person, too. You can always decline to try to contact friends of friends.
I don't do Facebook...period, but I once got a "friend" request, and two of the three extraneous people I was offered were people whom I know but who had absolutely -0- connection with the original "friender," and the one to whom I've spoken swears that I'm not mentioned anywhere in his account.
Can you see any way that may be possible?