Add A FaceBook Like Button To your website

It's easy to add a FaceBook Like button to your website. Just use the facebook like button generator located at:

http://developers.facebook.com/docs/reference/plugins/like

Once you have included Like buttons on a lot of your pages, you can use other social plugins to turn those user interactions into more engaging experiences throughout your site. For example, you can use the activity feed plugin to show users a stream of the recent likes and comments from their friends on your site, and you can use the recommendations plugin to show personalized page recommendations to your users based on the likes and comments across your entire site.

http://developers.facebook.com/docs/guides/web