From what I see, aside from Google employees and their close friends/family, it's mostly photographers that I see on G+
It could end up being a niche thing and who knows, slowly expand out from there.
It violates one of the obvious lessons from Google's other launches - scarcity. Remember how you needed an invite to do GMail or Google Voice? I think they forgot the value of building a community by making it feel cool, exclusive and alternative. But perhaps at this point it's as easy for Google to create a product that feels cool and exclusive at it is for Microsoft.
