Millions of Facebook users have been warned to check their privacy settings after the social network launched a tool to let friends reveal your location.
Facebook Places went live in Britain on Friday and allows anyone sharing details of their lives through the social networking site to also show where they are.
But security experts have slammed the gizmo as 'a massive risk to individual privacy'.
And there were further complaints after it was revealed friends can maliciously mark you as being at a location when you are not there.
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