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Why?

same as facebook and google+, can I opt out? Although this is a public space and a lot of people commit here, I haven't decided to go that path yet. So it might be a great feature for most but not everyone. As long as there is a setting somewhere to remove that, I am in.

Those data are public, therefore it is already searchable. Making this opt-out is only pseudo-privacy. When users don't want that people see information about them, just don't share them, ever. What is the meaning of sharing information to the public if you want to hide it?