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Just read your post, and it's spot on isn't it? You hit the nail on the head, and while it is a bold gamble, it's something they obviously feel is important. The thing I always notice about those guys is they are constantly experimenting, and if something doesn't work, they tweak until it does, even if it takes years. How long was Gmail in beta? Of course if it's clearly totally broken as Wave was, then it's back to the drawing board, but I wonder how much Wave technology is sitting behind G+ right now? :)