BR uploaded his contact list to Facebook. Then, a helpful box on facebook.com said "Hey, BR! Check this out, dude... Who else knows these people? (But we'll take a guess and pre-select some of your friends)."
Then those people see a message "BR recently added Sharpie as a friend and thinks you might know him! Click to add him!"
At which point some idiot (like me) clicks cuz, cool! I know Sharpie! And then (and only then) do we realize that no... you don't have a facebook profile... He just "added" you by e-mail address and we've now contributed toward sending you a barrage of facebook spam.
I think that explains it, more or less.