As for groups, I still fail to see the problem. You're notified when somebody (one of your Friends) adds you to a group; if you don't want to be part of the group, you remove yourself (and won't be able to be added again).
So, if your Friends aren't being malicious, there's no problem. If your Friends are being malicious, there's a very easy remedy (and you ought to reconsider who your Friends are.)
As for groups, I still fail to see the problem. You're notified when somebody (one of your Friends) adds you to a group; if you don't want to be part of the group, you remove yourself (and won't be able to be added again).
So, if your Friends aren't being malicious, there's no problem. If your Friends are being malicious, there's a very easy remedy (and you ought to reconsider who your Friends are.)
Tempest in a teapot, if you ask me.