I have recently completed to develop a short course that explains everything you need to know in order to add facebook social plugins to your web site. The community version of this course is available for free personal and academic usage at www.abelski.com. The commercial professional version is available at www.xperato.com.
You can find abelski short demonstration for adding the facebook social plugins to a web page at http://www.abelski.com/courses/facebookplugins/abelski_facebook_plugins_page.html.
The following video clips were taken from the facebook social plugins course I developed, and they include a short demonstration for using the facebook social plugins.
The I Like Button Plugin
The Facebook Recommendations Plugin
The Facebook Like Box Plugin
The Facebook Activity Feed Plugin
The Facebook Livestream Plugin
The Facebook Facepile Plugin
The Facebook Comments Plugin
The Facebook Login Button Plugin