Facebook Social Plugins
Social plugins are things like the Like button, the Share button, comments and other tools that let you share your experience off of Facebook with your friends and others on Facebook.
Social plugins include:
-Like button: Click Like to share and connect with things from other websites that you find interesting
-Share button: Click Share to write something about a link and then post it to your Timeline
-Embedded posts: Add any public post from Facebook to your blog or website
-Comments box: Publicly comment on another website using your Facebook account