Thanx for an answer, Leonid. A couple of notes, if You don't mind:))

1. This option is end-user's choice. How you can measure end-user choices on hundreds D7 sites?

2. Do you have FB account? Do you have dedicated members lists for different posts?

3. Boonex makes so many options which aren't based on popularity of user's and admin's wishes... and this one, most widely spreaded, acknowledged as social network's privacy standard - not? 

I'm' like many others standing here. want to Dolphin and UNA bee the alternative to monsters like FB, OK, VC & Co. And alternative HAVE to be comfort, intuitive, UX friendly. 

I stand on it : we need. for our customers, this option. Anybody who tells you that he don't - runs very open, very small, very non-privet network. 

And if all above not touching you - well, describe me, please, the comfort and UX friendly way to post in UNA my 73 photos from picnic so, that it'll be visible for Friends only, but not for my menager, my mom and my sis, who, for sure ARE IN MY FRIENDS LIST.