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Facebook has launched its location-based Places service in the UK.
It allows people to "check in" wherever they are and see who among their friends and other Facebook users is - or has been - at the same location.
The service also lists nearby businesses and attractions, and Facebook will target the locations it lists to each Places user.
"By default, users are opted in to the ability to be tagged by their friends, they are opted in to allowing their friends' Facebook apps to access their location information, and they are opted in to allowing 'non-friends' checked-in to the same place to see their whereabouts.
"This is all backwards - this should be deployed on a purely opt-in basis and no information about my whereabouts should be posted without my explicit consent, every single time a post is made."