Everything that I am getting from trying out google+ is pointing to it being a Twitter killer not a Facebook killer; the lack of things like private messaging (yes you can post with only one person able to view it, but it's pretty unlikely that they would ever notice that you wrote it). The whole system is geared towards 'share to group' rather than 'communicate with individual x'; even the video chat is. I don't think it's correct to say that they care about strong 2-way relationships.