That philosophy, however, completely goes against the entire concept of Google+ "circles": to let you present yourself differently to one circle than you do to another.
Not really. As you say - you can behave differently to different people. That doesn't change your person - it only changes what facet of your person is obvious to others. So the "true self" concept actually is very agreeable with the "facets of me" concept.
It's also similar to the difference between "private" and "public" life - My coworkers have no particular interest or value in knowing how I bring out my trash, but the way that I do does not violate the consistency with the way that I behave at work.
