K2 is a popular Joomla extension that provides many features and capabilities for Joomla users. Avatar image for users is one of these features. K2 Online Users is a simple Joomla module for displaying the avatars of online users. It uses K2 avatar of each user to show a list of online users. You can easily customize different options of this module. K2 Online Users provides the capability of excluding the given users. You can limit the number of displaying avatars and load more avatars by using AJAX technique. This module has three different layouts for showing the avatar and name of online users. You can easily control and customize this module via module setting at admin panel. Before installing this module, you have to install K2 component. This module can be installed on Joomla 2.5.x, Joomla 3.x.