isFacebook() public method

Is the browser from facebook?
public isFacebook ( ) : boolean
return boolean True if the browser is from facebook otherwise false
$config->set('config_store_id', STORE_ID);
$loader->library('browser');
$browser = new Browser();
if ($browser->isMobile()) {
    if ($config->get('config_redirect_when_mobile')) {
        location($config->get('config_mobile_url'));
    } else {
        $config->set('config_template', $config->get('config_mobile_template'));
    }
} elseif ($browser->isTablet()) {
    if ($config->get('config_redirect_when_tablet')) {
        location($config->get('config_tablet_url'));
    } else {
        $config->set('config_template', $config->get('config_tablet_template'));
    }
} elseif ($browser->isFacebook()) {
    if ($config->get('config_redirect_when_facebbok')) {
        location($config->get('config_facebook_url'));
    } else {
        $config->set('config_template', $config->get('config_facebook_theme'));
    }
}
$response->addHeader('Content-Type: text/html; charset=utf-8');
// Language Detection
$languages = array();
$query = $db->query("SELECT * FROM " . DB_PREFIX . "language");
foreach ($query->rows as $result) {
    $languages[$result['code']] = array('language_id' => $result['language_id'], 'name' => $result['name'], 'code' => $result['code'], 'locale' => $result['locale'], 'directory' => $result['directory'], 'filename' => $result['filename']);
}
$detect = '';
if (isset($request->server['HTTP_ACCEPT_LANGUAGE']) && $request->server['HTTP_ACCEPT_LANGUAGE']) {