The Gaboinked! Facebook Badge Plugin for WordPress easily displays a Facebook Badge in the sidedbar of your self-hosted WordPress Blog.
Q: Facebook has chnaged their site again, what do I do now?
A: Visit http://gaboinked.com for the most recent updates and support. Support is currently being provided for version 1.1.x and above. If you are using a lower version please upgrade at: http://gaboinked.com.
Q: Will the Gaboinked! Facebook Badge Plugin for WordPress sidebar Widget work on WordPress.com hosted blogs?
A: Unfortunately, not that I am aware of at the moment. You may contact the WordPress.com Support Team and request that they added it to their Plugin Pool, and they may make it available for you and others to use.
Q: Do I need a Facebook Profile?
A: Well of course, simply visit http://facebook.com to get started if you don't.