When anyone who has friended them on foursquare checks in at or near a location that's in the book they'll see a pop-up tip reminding them to check the book for coupons.

当任何加了它们为好友的人在他们书中的位置或者附近签到，他们就会看到一条弹出提示，告诉他们有书券可用。

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The Kindle tells you your "location" in the book and gives the percentage of the book you've read, rather than showing a page number.

Kindle会告诉你在这本书中的“位置”，给出一个已读的百分比来，而不是显示页码。

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Only a small number blatantly compromised privacy: 36 accessed the device's location without first informing the user; another five mined data from the user's address book without permission.

只有少数公开协定的隐私，36个被访问的设备位置没有事先通知用户，还有5个未经用户许可从用户的地址簿挖掘数据。

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Your current location in the book in displayed in the lower left-hand corner.

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The service, which is accessible via an iPhone application or the Web, claims it is the first location-aware mobile address book.

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Now Facebook, Apple, Google and smaller app developers are collecting nuanced details like location data and address-book info, and across a wider breadth of people (more than a billion in the case of Facebook).

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