public static function find_by_email($email)
	{
		if (empty($email))
		{
			return false;
		}

		$db = \App::get('db');
		$db->setQuery("SELECT username FROM `#__xprofiles` WHERE `email`=" . $db->quote($email));

		$result = $db->loadColumn();

		if (empty($result))
		{
			return false;
		}

		return $result;
	}