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    <p>Once that user accepts permissions to your app, you can call the <code>/me/friends</code> to get a list of friends, then you can parse thru that list looking at the <code>installed</code> property to determine if that friend is one of your app users.</p> <p>Another way, the better of the two as only one call as well as no parsing after the call, would be to use FQL to query the friends list </p> <p><code>fql?q=SELECT uid, name, is_app_user FROM user WHERE uid IN (SELECT uid1 FROM friend WHERE uid2=me()) and is_app_user=1</code></p> <p><strong>EDIT</strong></p> <p>PHP example of how to run FQL code. Taken from <a href="http://developers.facebook.com/docs/reference/fql/" rel="nofollow">http://developers.facebook.com/docs/reference/fql/</a></p> <pre><code>&lt;?php $app_id = 'YOUR_APP_ID'; $app_secret = 'YOUR_APP_SECRET'; $my_url = 'POST_AUTH_URL'; $code = $_REQUEST["code"]; //auth user if(empty($code)) { $dialog_url = 'https://www.facebook.com/dialog/oauth?client_id=' . $app_id . '&amp;redirect_uri=' . urlencode($my_url) ; echo("&lt;script&gt;top.location.href='" . $dialog_url . "'&lt;/script&gt;"); } //get user access_token $token_url = 'https://graph.facebook.com/oauth/access_token?client_id=' . $app_id . '&amp;redirect_uri=' . urlencode($my_url) . '&amp;client_secret=' . $app_secret . '&amp;code=' . $code; $access_token = file_get_contents($token_url); // Run fql query $fql_query_url = 'https://graph.facebook.com/' . '/fql?q=SELECT+uid2+FROM+friend+WHERE+uid1=me()' . '&amp;' . $access_token; $fql_query_result = file_get_contents($fql_query_url); $fql_query_obj = json_decode($fql_query_result, true); //display results of fql query echo '&lt;pre&gt;'; print_r("query results:"); print_r($fql_query_obj); echo '&lt;/pre&gt;'; // Run fql multiquery $fql_multiquery_url = 'https://graph.facebook.com/' . 'fql?q={"all+friends":"SELECT+uid2+FROM+friend+WHERE+uid1=me()",' . '"my+name":"SELECT+name+FROM+user+WHERE+uid=me()"}' . '&amp;' . $access_token; $fql_multiquery_result = file_get_contents($fql_multiquery_url); $fql_multiquery_obj = json_decode($fql_multiquery_result, true); //display results of fql multiquery echo '&lt;pre&gt;'; print_r("multi query results:"); print_r($fql_multiquery_obj); echo '&lt;/pre&gt;'; ?&gt; </code></pre>
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    1. POGet facebook friends upon registration
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    1. COThank you for your help. To be completely honest, I need to see an example on how to implement that. (I'm just learning) and I really don't know how or where to use fql.
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    2. COI did give an example of using the FQL I wrote the **complete statement** for you. See http://developers.facebook.com/docs/reference/api/ for examples of how to call this FQL statement. Also http://developers.facebook.com/docs/reference/fql/ for more info on FQL. A lot of great example codes for doing it there.
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    3. COSorry should have mentioned that I'm not implementing php. Trying to find cases using Django/Python. Seems so easy with php, but alas; I'm stuck with what I'm using.
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