The gangs taskforce in Lambeth said using stop-and-search tactics they would track down the offender in about three or four cases in 10 - although the phone was not always recovered.

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The video shows RIOT using a browser-based search interface to track the Raytheon employee across Facebook, Twitter, Foursquare and Gowalla (which was acquired by Facebook last year).

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There are at least four reasons why a well-intentioned search for greater efficiency has gotten so far off track.

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Google 's ( GOOG - news - people ) search engine, so she's created Google Alerts to track.

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The application combines voice-recognition technology with Google's search index and the iPhone's ability to track a user's location to offer results keyed to his or her whereabouts.

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For radar systems as presently understood to detect and track a B-2, an enormous energy supply would be needed to power the search radar.

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Close to Spion Kop, a stone quarry spills across the track where you can search through the stones to find the remnants of flint spearheads and knife-blades made by the Ngaro people thousands of years ago.

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Smith, one of many who have devoted themselves to the search, takes the viewer through the entire film, boarding subways, taxis and airplanes to track down his quarry--all to no avail.

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