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The changes come as Facebook aims to make the social networking site more user-friendly and broaden the types of user data it sells to advertisers.

Its PR boss, Elliot Schrage, told The Register that information would enable advertisers to benefit from "conversion tracking", a system that helps measure the effectiveness of their ads and make them more relevant.

Facebook users who enable their profile to be seen by anyone will find their wall posts and news feeds appearing on search engines.

The site also plans to exploit users’ location, adding it to the content already obtained from a user’s profile and Facebook usage.

The privacy policy has also been rewritten in a bid to appease the Canadian privacy regulator, which had felt the previous policy was "confusing and incomplete".

Facebook has given its users a seven-day period to comment on the new policy before it is applied.