I have always signed in through FB before and never had that happen. This just started happening like twenty minutes ago. I found a button on my fb that said revoke the posting privileges of BG on FB so I ended up doing that. It was even posting when I made replies to other peoples smurf. I am like no bueno man.
I just posted about this. I've always signed in through fb and it started doing it to me today. Someone else helped me, you just go to your account and hit privacy and there will be a link at the bottom to disconnect fb and bg.