How To Cancel A Friend Request On Facebook ?
If you have sent a friend request on Facebook which is not yet addressed, then there is no way you can cancel the sent request.
( **Update** : FB has come up with a way to cancel a Friend request. Please read this post to know how to cancel a friend request / invite on Facebook. )
Facebook automatically terminates that request after 3 months. Till then the request will be present in his account, unless the user decides to reject or accept it.
This was the case in my account a couple of months ago. May be Facebook should change this rule.
At times, we may end up sending friend request to the wrong person, by mistake. This feature will be handy then