How to get the Facebook iFrame Tab url (including parameters) from within the app?

Posted by martincarlin87 on Stack Overflow See other posts from Stack Overflow or by martincarlin87
Published on 2012-04-05T11:04:58Z Indexed on 2012/04/05 11:29 UTC
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I think there are a few similar questions that seem to suggest using app_data in the signed request (http://developers.facebook.com/docs/authentication/signed_request/) but I'm not sure if it will be possible to do what I am trying to achieve with it as I've never used it before.

If I have my Facebook 'Tab' Url as follows:

http://www.facebook.com/pages/PAGE_TITLE/PAGE_ID?sk=app_APP_ID

What I want to do is add an extra parameter on the end as follows:

&WT.mc_id=email-uk-8014

The reason for this is for tracking purposes and links will be sent out of the form

http://www.facebook.com/pages/PAGE_TITLE/PAGE_ID?sk=app_APP_ID&WT.mc_id=email-uk-8014

and the extra parameter will allow us to track the campaign id.

As you can see I have no way of knowing the value of the parameter beforehand as it depends on the link clicked by the user so is it possible to somehow get the value of the WT.mc_id parameter inside my iframe app?

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