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> The difference is that Google, Facebook, et al are opt-in

With the remarkable penetration of things like google analytics and the ilk, this may not be quite that simple.

Moxie has also pointed out that the choice is not simply "Do I want to be surveilled by Google?" or "Do I want the telco to track my every move?". It's stuff like "Do I want to stop talking to all of my friends who use GMail?". Or "Do I want to not have a cellphone and prevent myself from participating in informal social event planning?".

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