This is true for me too, all my serious content is privately available to curated circles on google plus, while all the meaningless social chit chat is done through my facebook account. I would create the equiv of a Facebook Circle if enough friends were also on google plus, but the network effect is such that its not viable yet. Facebook is the lowest common denominator, and most people dont have the time or mental space, to make a change, if they think the current system (Facebook) is good enough. As more tools support posting the same content to multiple networks simultaneously, this may change, but only if laziness and familiarity with current clients is overcome. This same issue will slow the adoption of Win 10 as well.