In order to get your facebook fanbox to display right you will need to use the javascript in a proper location. Not sure what skin your working with but heres some tips to get you resolved.
Put your javascript file just before the facebook box. I know the instructions say put it in a header file but its not necessary inside Jamroom.
If your still having problems and or you have questions you can contact me via skype or the forums here and ill help you out.
{* Facebook Java Script *}
<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=488315271231911";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
{* facebook *}
<br>
<div class="body_3">
<center><h3>Facebook | Activity</h3></center>
<br>
<div class="fb-like" data-href="http://YOURSITE.com" data-width="245" data-layout="standard" data-action="like" data-show-faces="true" data-share="true"></div>
<br>
<div class="fb-activity" data-app-id="488315271231911" data-site="YOURSITE.com" data-action="likes, recommends" data-width="245" data-colorscheme="light" data-header="true"></div>
<br>
</div>
<br>
This works across all browsers including chrome.
The example shown above is for a fb like box and fb activity
updated by @developer-networks: 01/11/14 08:53:11AM