Tagmalion Forum

Tagmalion forums are true social forums because, instead of a forum being hosted on a site, forums are hosted on a tag. Any site can share the same forum by virtue of using the same tag

Creating a forum for a tag is as simple as using the following code:

$('#mydiv').forum({"tag" : "jquery.tagmalion.forum"});

The tag argument can be anything you want it to be, all sites with the same tag will share your forum; what's posted on those sites will appear on your forum; what's posted on your site will appear on those sites.

Have a look at Tagmalion Forums for more details and a working example