As you might expect, the wearable touts Bluetooth for connecting to your smartphone and an accelerometer for tracking purposes.

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And the murky question of tracking users for law enforcement purposes?

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One big obstacle in winning more of that business was Google co-founder Mr. Page, who objected to letting Google's advertising customers work with companies that installed "cookies" on people's computers for purposes of serving ads and tracking their performance.

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As Afghanistan has shown, it can (and often should) be unilateralist in military matters, but it needs a more co-operative, even consensual approach for other purposes, including diplomacy, intelligence-gathering, financial tracking and above all in the battle for hearts, minds and ideas.

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But tracking those payments, keeping records for tax purposes and enticing confused or disinterested workers to sign up for health coverage can be a huge hassle.

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An article on TorrentFreak reports that PayPal is requiring private BitTorrent tracking sites to provide them free access for purposes of monitoring user content for possible copyright infringement.

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But like any good privacy paranoiac, Kilpatrick can easily imagine how the face-tracking software he sells can be used for less benevolent purposes.

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While public authorities will certainly be challenged by the introduction of a monetary unit that cannot be manipulated for political purposes, bitcoin in some cases does have the ability to provide tracking capability that far exceeds that of national cash or money substitutes.

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Google and Apple responded by saying that users can turn location tracking on their phones off, and that location sent back to their companies for the purposes of creating large crowd-sourced databases is anonymized.

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