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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Next to each address book entry is an icon that when selected will cause the unit to draw a map from your current location to the address given in the address book.

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Bashir came up with a simpler solution, both to centralize information on the best things to do in any location and simultaneously enable travelers to book those activities online.

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One twist on the typical geo-location services model is that WhitePages plans to provide business recommendations based on address book popularity.

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The scheme is similar to a treasure hunt launched in 1979 by the author of a British children's book, "Masquerade, " which had clues to the location of an 18-carat jeweled golden hare hidden somewhere in Britain.

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This is a book, but it's also an app that mixes in user-generated feedback and location-based participation.

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Robert Scoble and I have been collaborating since July on Age of Context, a book about the convergence of five technology forces: mobile, social media, big data, location-based and sensors.

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