What about a way of creating all your G+ circles based on Facebook friend clusters as well?
Katango basically provided that service for free, but they got acquired by Google. http://techcrunch.com/2011/11/10/google-acquires-katango-the...
Maybe pricing that works out so it is free for general users and has a low price point for "pro" users?
Katango basically provided that service for free, but they got acquired by Google. http://techcrunch.com/2011/11/10/google-acquires-katango-the...