First demonstration of the true purpose of Google's data gathering?
http://www.bbc.co.uk/news/technology-10850875
'Creepy' attack
Many people go online via a router and typically only the computer directly connected to the device can interrogate it for ID information.
However, Mr Kamkar found a way to booby-trap a webpage via a browser so the request for the ID information looks like it is coming from the PC on which that page is being viewed.
He then coupled the ID information, known as a Mac address, with a geo-location feature of the Firefox web browser. This interrogates a Google database created when its cars were carrying out surveys for its Street View service
This database links Mac addresses of routers with GPS co-ordinates to help locate them. During the demonstration, Mr Kamkar showed how straightforward it was to use the attack to identify someone's location to within a few metres.