If you do this, here's what you have to do .
Go to "Settings", then "Privacy Shortcuts", then "See more privacy settings", then "Who can send you friend requests", then turn it to "Everyone".
I had mine set to "Friends of friends" instead of "Everyone". If yours is set to "Friends of friends" also, no one will be able to send you a friend request.
Sent from deep in the woods where the critters roam.