No.. this isn't about those who you might question on their reasons for friending you (even after they stole the last piece of chocolate cake!). This is about people who friend you just to spam you and your friends. This is a new method of spammers getting eyeballs on what it is they are "hawking":
http://www.huffingtonpost.com/2011/0..._n_821584.html
So be careful and remove personal info from Facebook (e.g., there is NO reason to have your home address, home phone or real name on Facebook). Remember that if you put any of that info on there, someone, somewhere will likely find a way to it.
And not all those out on the net are friendly like here.