Get Facebook content from node_load()
Ok, I found!

function fb_event_crawler_node_load($nodes, $types) {
    foreach ($nodes as $node) {
        if ($node-&gt;type=="event"){
            $fb_url = $node-&gt;field_event_url['und'][0]['value'];
            $url = parse_url($fb_url);
            if (!$url['host'] == 'www.facebook.com'){
                echo t('This is not a Facebook URL');
            }

            $path_exploded = explode("/", $url['path']);
            if (!$path_exploded[1] == 'events'){
                echo t("This is not a Facebook event page!");
            }

            $fb_event_id=$path_exploded[2];

                // dpm($path_exploded);


            $app_id = isset($app_id) ? $app_id : variable_get('fboauth_id', '');
            $app_secret = isset($app_secret) ? $app_secret : variable_get('fboauth_secret', '');
            $app_token_url = "https://graph.facebook.com/oauth/access_token?"
            . "client_id=" . $app_id
            . "&amp;client_secret=" . $app_secret 
            . "&amp;grant_type=client_credentials";

            $response = file_get_contents($app_token_url);
            $params = null;
            parse_str($response, $params);
            $access_token=$params['access_token'];

                //echo($params['access_token']);

            $fbquery = fboauth_graph_query($fb_event_id."/", $access_token);

            dpm($fbquery);
        }
    }
}