"Even if Google, for example, are scrupulous about keeping the location data anonymous by no means a given the same can't be said of all the location-aware websites people will use," he said.
"There's then the potential that this data could be leaked or misused by corporations or governments in ways the user never considered."
What Google says
On its site, Google says its Google Location Service "allows websites to access your location if you opt-in".
"If the website is a non-Google website, we do not have control over the website or its privacy practices.
"Please carefully consider any website's privacy practices before consenting to share your location with that website."
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