Framework is currently using Disqus on a few of our sites. Here is the Wikipedia entry for Disqus (click here). The Wikipedia entry states that "As of August 10, 2010, the service had over 13 million registered users and 500 thousand communities".
"Disqus (dis·cuss • dĭ-skŭs') is all about changing the way people think about discussion on the web. We're are big believers in the conversations and communities that form on blogs and other sites."
Real Time Comment System
Comments become more like live discussions with realtime posting and updating. By offering a faster, more intuitive experience, Disqus is everyone's favorite way to comment
Notification and Reply System
The notification system lets people know when they've received a response. Best of all, they can continue the conversation straight from the email.
InLine Media
Full integration with media services such as Youtube, Flickr, and more. Attach media such as photos and videos right within the comments.
Mobile Commenting
Fully compatible with mobile websites for commenting while on the go. The default mobile theme is formatted with smartphones, like the iPhone or Android phones, in mind.
(<div id="disqus_thread"></div>
<script type="text/javascript">
/* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
var disqus_shortname = 'example'; // required: replace example with your forum shortname
// The following are highly recommended additional parameters. Remove the slashes in front to use.
// var disqus_identifier = 'unique_dynamic_id_1234';
// var disqus_url = 'http://example.com/permalink-to-page.html';
/* * * DON'T EDIT BELOW THIS LINE * * */
(function() {
var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js';
(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
<a href="http://disqus.com" class="dsq-brlink">blog comments powered by <span class="logo-disqus">Disqus</span></a>)