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I looking for a way to get notified from facebook whenever a new post has been created. So far the only solution I've found is cron job to check every few minutes. Don't the facebook sdk provide such method?

Thanks

Use Facebook Graph API Subscriptions

https://developers.facebook.com/blog/post/2012/01/31/how-to--subscribing-to-data-changes-using-the-real-time-updates-api/

<?php

  $app_id = 'YOUR_APP_ID';
  $app_secret = 'YOUR_APP_SECRET';
  $app_url = 'http://YOURAPPURL';
  $fields = 'feed';
  $verify_token = 'YOURVERIFYTOKEN';

  // Fetching an App Token
  $app_token_url = 'https://graph.facebook.com/oauth/access_token?client_id='
                   .$app_id.'&client_secret='.$app_secret
                   .'&grant_type=client_credentials';
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $app_token_url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  $res = curl_exec($ch);
  parse_str($res, $token);

  if (isset($token['access_token'])) {
    // Let's register a callback
    $params = array(
      'object'
        =>  'user',
      'fields'
        =>  $fields,
      'callback_url'
        // This is the endpoint that will be called when
        // a User updates the location field
        =>  $app_url . '/index.php?action=callback',
      'verify_token'
        =>  $verify_token,
    );

    curl_setopt($ch, CURLOPT_URL, 'https://graph.facebook.com/'
                                  .$app_id.'/subscriptions?access_token='
                                  .$token['access_token']);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
    $res = curl_exec($ch);
    if ($res && $res != 'null') {
      print_r($res);
    }

    // Fetch list of all callbacks
    curl_setopt($ch, CURLOPT_POST, 0);
    $res = curl_exec($ch);
  }
  if ($res && $res != 'null') {
    print_r($res);
  }
  curl_close($ch);

?>

Some more helpful links:

https://developers.facebook.com/docs/graph-api/reference/app/subscriptions/

https://developers.facebook.com/docs/graph-api/real-time-updates/