Okay, I understand that you want a way to decrease the probability of your data being crawled by Google, and while that is possible through shutting down all ssb viewers on all pubs you are connected to via 2 hops, I'm telling you that it's highly unlikely that this will happen in your friends-of-friends network. So you either have to be very strict about your circle of friends and FoF, or just give up the desire for forgettability.