You can add a facebook share button to your EveryWhereChat facebook fan page chat room by leveraging the fb:share-button tag.
Adding this tag will allow people to share your chat room link and drive people to your chat room. Below is the full fbml code for adding your chat room with the facebook share button as well as instructions for customizing the share text for your fan page.
Facebook FBML Chatroom Code
<fb:swf width='760' height='460'
Click Share to invite your friends to chat with you right now!
<meta name="medium" content="mult"/>
<meta name="title" content="Come chat with me on EveryWhereChat!"/>
<meta name="description" content="Come chat with me right now in the EveryWhereChat chat room"/>
<link rel="target_url" href="http://www.facebook.com/everywherechat?v=app_6009294086"/>
Customize Share Button
Customizing the share button for your EveryWhereChat fan page chat room by editing the values described below.
title = Title is the title of your page.
description = Description of the page you are pointing people to
link = This should be the link of the page that your FBML application for chat. Simple navigate to your chat room and copy the link in the address bar.
Example of the share button in action!