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Published 16:04 19 Sept 2015 BST
Updated 16:04 19 Sept 2015 BST

If this sounds familiar, it's because a year ago Facebook announced its intention to begin gathering this information. - It's only now that it's being put to use.
If the ads make you feel like Facebook is watching a bit too closely, you can opt out of targeted ads by modifying your 'Ad Preferences' in your settings.Explore more on these topics: