How can I know who bookmarked my facebook app? [closed]

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Is there a way to show who bookmarked my facebook app ?

Using facebook API (PHP/Javascript SDK etc)

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No, it would reduce user's privacy

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If someone enters to your app from bookmark you have ?ref=bookmarks in URL. You can check GET variable and save that information for later use.

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I don't think you can access that information, even for the client side there's no such thing in JScript; Though if you give users the option to bookmark your site with a special bookmarklet(? example http://www.delicious.com/help/bookmarklets) you might get to run some code when clicked, and so know if it's accessed through a bookmark.