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Just a note; when I added the facebook plugin to my wordpress install it slowed my page load time dramatically. Make sure to check yours doesn't do the same if you decide to go the facebook route. However, I did notice a large increase in comments once I enabled the plugin. (I assume since the user didn't need to login - even though I didn't require an account to post on my blog, I figure most people are unfamiliar with the wordpress commenting system) I used: http://www.webpagetest.org/