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It is possible to know programmatically if you are logged into social web sites. Check the header (and then the HTML source) of this WSJ microsite to see what other user details besides your current login status on social web sites can be tracked (I found it creepy so I now use a Google Mobilizer Bookmarklet when I visit domains that are not on my ...


You can't get this information because cookies are private for every site. Immagine that Facebook will analyze how many users goes in your site through cookies, you'll be happy of it?

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