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If you want to pass multiple querystring params though the app_data param, you can urlencode it. All querystring params that need to propagate through a Facebook tab should be url-encoded in the app_data var. In other words, the "&" and the "=" need to be url-encoded (especially if passing more than one param). <h2>Examples</h2> <h3>GOOD TAB URL (this passes all 3 params):</h3> <a href="https://www.facebook.com/pages/yourpagename/56789?sk=app_12345&app_data=var1%3D123456789%26anothervar%3Drawr%26athird%3Dmeow" rel="noreferrer">https://www.facebook.com/pages/yourpagename/56789?sk=app_12345&app_data=var1%3D123456789%26anothervar%3Drawr%26athird%3Dmeow</a> In the app_data from this signed request, I got this value: var1=123456789&anothervar=rawr&athird=meow <h3>BAD TAB URL (this passes only the first param through the signed_request):</h3> <a href="https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=var1=123456789&anothervar=rawr&athird=meow" rel="noreferrer">https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=var1=123456789&anothervar=rawr&athird=meow</a> In the app_data from this signed request, I ONLY got this value: var1=123456789 (Facebook dropped the rest) You can even give your media team instructions like this =) <blockquote> Media team, Here is an online utility to urlencode the querysting data you want to embed in the app_data param: <a href="http://meyerweb.com/eric/tools/dencoder/" rel="noreferrer">http://meyerweb.com/eric/tools/dencoder/</a> Base Url: <a href="https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=" rel="noreferrer">https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=</a> Steps: <ol> <li>Go to <a href="http://meyerweb.com/eric/tools/dencoder/" rel="noreferrer">http://meyerweb.com/eric/tools/dencoder/</a> </li> <li>Type var1=123456789&anothervar=rawr&athird=meow in the box</li> <li>Hit the Encode button </li> <li>You’ll get var1%3D123456789%26anothervar%3Drawr%26athird%3Dmeow which becomes your app_data param. Append that to the baseUrl noted above like this: <a href="https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=var1%3D123456789%26anothervar%3Drawr%26athird%3Dmeow" rel="noreferrer">https://www.facebook.com/pages/yourpagename/12345?sk=app_56789&app_data=var1%3D123456789%26anothervar%3Drawr%26athird%3Dmeow</a> (this is the URL with the tracking params for the [banner ad] [online media] [etc])</li> </ol> </blockquote> p.s. Querystring params in non-tab pages are handled fine (<a href="https://apps.facebook.com/yourappname/Canvas.aspx?var1=123456789&anothervar=rawr&athird=meow" rel="noreferrer">https://apps.facebook.com/yourappname/Canvas.aspx?var1=123456789&anothervar=rawr&athird=meow</a> does not strip out qs params like what happens in the Tab, for example).
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1. POIs it possible to pass parameters to the callback URL of a FB app which is accessed through a tab?
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1. POIs it possible to pass parameters to the callback URL of a FB app which is accessed through a tab?
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