I don't add people if I don't know them. If they really want to join my friend list, they can send a pm.
As Namechange said, Instant Messenger give you a notification, and also a beep when a person send you a friend request.
If you don't use IM, just check one time per week if you have pending request, it's enough.
Not needed, so I voted no sorry.
This post was edited by Nico on Feb 28 2014 10:10am