title: Forum Software Compatible with Facebook [and Wordpress] Integration
body: <p>Which forum software is the most usable and compatible with Facebook and Wordpress integration? </p>
  
  <p>By usable, I mean that is easy to use for end-users, and also easy to make modifications/plugins for coders. The forum's speed is also a consideration. And by Facebook and Wordpress integration, I mean us something like Facebook Connect in which users can register using their Facebook account.</p>
  
  <p>I'm thinking of vBulletin (vB), Invision Power Board (IPB), and Simple Machines Forum (SMF); but still not sure which one to use. If there's any more suggestion, I'll be glad to know, though I'm not considering bbPress since I need something bigger than that..</p>
  
  <p>Any ideas? Thanks a lot.</p>