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Re:Ask HN: Any space for a micro-website for portable discus... by SkyMarshal on Saturday August 04, 2012 @11:11AM (#4338650)
G+ meets almost all of your criteria, only thing it's missing is the ability to toggle discussions public or private after the fact, but you can at least control that aspect when creating the conversation.
Re:Ask HN: Any space for a micro-website for portable discus... by sherjilozair on Saturday August 04, 2012 @11:21AM (#4338677)
G+ is surely the closest thing to what I envision. Yet, I am not convinced.

I once tried 'chatting' with my girlfriend on google+ using a private channel. The fear of some error happening, and our messages being accidentally shown to public was too much, and we switched back to chat. Google+ us social and public. Not technically. But that is what they are trying to be, and advertising to be.

Re:Ask HN: Any space for a micro-website for portable discus... by elssar on Saturday August 04, 2012 @11:31AM (#4338705)
I have had private chats using G+ posts and I attest that they never turned public. Once you make a post, you can't change it's visibility. You can only delete it, or lock it down - comments or reshares.

Though I think gPlus + Wave would be the ideal such environment for me.