WP Bulletin Board (WPBB) is an easy to use forum for your WordPress site with Facebook and Twitter features.
I'd rate this plugin a solid four (four-and-a-half if half-stars were available!) if its Facebook integration didn't appear so buggy: quite a lot of folks can't get it to work no matter what.
Otherwise, this is a nicely simple and clean forums plugin. Would definitely pay for a premium version!
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