This is a verbatim copy of one of my postings at Google+.
A proposal to Google how to improve privacy in Google+
Hi there Google! It’s very nice how one can restrict postings to a certain audience.
But what would also be very nice is when you could restrict other people from seeing to what audience you posted something.
Alice posts something to her circle “Friends”. She’s got 34 people in this circle.
Bob, being a member of her circle “Friends”, has 14 friends in common in all his circles.
However, Bob also sees Charly, who’s only a friend of Alice, but not of Bob.
I propose that Google adds a feature that Bob will only see the 14 friends he has in common with Alice, and a note “and 20 other people”. But Bob should never see the identitiy of those other people, means, he’d never see Charly.
Also, I’d like to see a feature saying “Prohibit this posting from being shared”. Sure, it won’t prevent people from sharing it by other means, let’s say copy&paste the text or downloading the pictures and resharing. But just the notice “This post was originally shared with a limited audience” doesn’t prevent anyone from unintended consequences.
Edit: While we’re at it, it’d be really neat if you could change the intended receiving circles afterwards.
P.S.: I’d like to see those features optional, but enabled by default, until the user decides to change it. Kthxbai!