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You can still keep most of your personal details under lock and key, limiting access to specific elements to yourself, your Circles, extended Circles, or anyone on the web -- Google does require that your full name and gender be available to everyone, however. Want your social network profile to be forever visible to you and you alone? MySpace is still around. For a little while longer, at least.
It's exactly like facebook where i can limit certain things and only my name and gender are available to the public... so it doesn't really make any sense. my profile shows my name and gender, and everything else is limited to my circles...