Bpchat is a buddypress, WordPress user based chat plugin. If this plugin installed to any user based wordpress blog, forum, community, directory, ecommerce or buddypress social network site then all the logged in users automatically can chat each other instantly. This plugin is also intended to make a easy way to chat like facebook for dating, matrimony, community social network site based on wordpress and buddypress framework.
Demo: http://codecanyon.net/item/wordpress-buddypress-users-chat-plugin/10776067