Oh! Thanks Miriam. I didn't know that you replied because I hadn't check back in a while.
I made sure HTML tidy was disabled and I put the code into a HTML block and it worked well.
I have a question about the code on your wiki:
data-url="http://www.YOURURL.com"
should I put my moodle URL here or my twitter URL? probably my moodel URL, right?
Also, I am a big fan of stumbleupon because it is not blocked in schools like Facebook sometimes is.
Where would I put this code (taken from the official stumbleupon badge page http://www.stumbleupon.com/dt/badges/create )?
Would this go in a HTML block?
<!-- Place this tag where you want the su badge to render -->
<su:badge layout="2" location="%PERMALINK%"></su:badge>
I don't know where to put the code below. Make a new .js file?
<!-- Place this snippet wherever appropriate -->
<script type="text/javascript">
(function() {
var li = document.createElement('script'); li.type = 'text/javascript'; li.async = true;
li.src = ('https:' == document.location.protocol ? 'https:' : 'http:') + '//platform.stumbleupon.com/1/widgets.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(li, s);
})();
</script>
(I subscribed so I will get your response this time 
)