Adding Facebook “Like” buttons to your website

The “Like” button allows users to share your content with friends on Facebook. When the user clicks the Like button on your site, a story appears in the user’s friends’ News Feed with a link back to your website. There are 2 versions, the iframe version and the XFBML version.

“The Facebook Like button is undoubtedly the most important Social Plugin. It can boost your website traffic significantly and adds up to your website user interaction.”