My jomsocial site just got hacked... but i got something interesting:
upload feature suddenly does not work .. i compare with my backup (the working one)

on com_community/controllers/photos.php
the line:
$fileName = JApplication::getHash($photo->image . time());

are suddenly change into:
$fileName = JUtility::getHash( $imageFile . time() );

of course its crash because getHash in JUtility is deprecated in Joomla 3.0

also from the header file:

/** 
* @copyright (C) 2013 iJoomla, Inc. - All rights reserved.
 * @license GNU General Public License, version 2 (http://www.gnu.org/licenses/gpl-2.0.html)
 * @author iJoomla.com <[email protected]>
 * @url https://www.jomsocial.com/license-agreement
 * The PHP code portions are distributed under the GPL license. If not otherwise stated, all images, manuals, cascading style sheets, and included JavaScript *are NOT GPL, and are released under the IJOOMLA Proprietary Use License v1.0
 * More info at https://www.jomsocial.com/license-agreement
 */

/**
 * @package		JomSocial
 * @subpackage  Controller 
 * @copyright (C) 2008 by Slashes & Dots Sdn Bhd - All rights reserved!
 * @license		GNU/GPL, see LICENSE.php
 * RCE Patched by d3b~X

 */

Since i'm about to restore with the original.. here's i attached the hacked one if you need to review it..

as most hacker proud of, they leave footprint...
reoncomics.com/ganteng.php

This is the issue we fixed few weeks ago, but you need to make sure that you have cleaned up your site completely after patch is applied
www.joshpate.com/2013/01/how-to-fix-hack...-on-joomla-web-site/