Perhaps there could be a service where you could connect to people you "hate" ? So whenever you get an unwanted invite you would (perhaps automatically) send an invite for that person to join your network of people-who-are-not-my-friends.
Way ahead of you my Dutch friend.
Robert goes on
If nothing else such a network would provide material for dozens of Ph.D. students... Inevitably there will be lots of interesting conflicts between the friend and not-friend networks! Yes it is really time to step up to richer notions of the edges of those "social" graphs. Just "is-a-friend-of" or "knows" is no longer cool.
Agreed. Subtleties such as 'enjoyed hot tubs with in foreign lands' need to be captured.
I also suggest there is a dissertation waiting to be written on the phenomenon of 'social network amnesia' - that confused feeling you experience when, in looking through any one of your friends lists, you ask yourself why half of its members are on it.