Embed a Bublaa Forum into your site and replace your comment system with Bublaa Comments (optional).
As Judge for Bing.com i give the developer my professional review.
A WordPress site owner is most likely attend to install your plugin. After installing and activating your plugin the webmaster in question likely attend un-install your plugin.
Mention in your description that your plugin requires a 3rd party website in order to use the forum.
All plugins that needs to connect external will slow the website in question down.
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