I can see where sending mega friend requests to unknowns might raise a flag. But I get all kinds of
"so-and-so is a friend of your friend, you might know them" and "so-and-so has # mutual friends" type of notices all the time.
Seems like Facebook encourages one to increase the number of friends they have.
My guess is the firend has "territorial" issues, perhaps something to do with ssethi54's motive.
For example, I doubt most of my friends would mind if I interacted with friends on their friend list to sociallize, but if I used thier friend list to have more people for promotion purposes I can see why some would be upset.