At last facebook has developed wordpress plugin to make everything easier for webmaster to integrate various kinds of features of Facebook. Facebook itself developed this plugin.
You can download the facebook plugin from?http://wordpress.org/extend/plugins/facebook/
Really it will be fantastic if webmaster can use Facebook plugin for their wordpress site. It will make more easiest way to interact with fans, users. I personally think Business website which is built in WordPress they can be?benefited?with this.