The Share button lets people add a personalized message to links before sharing on their timeline, in groups, or to their friends via a Facebook message.
The Like button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content on the web and share them on Facebook.
The Follow button lets people subscribe to the public updates of others on Facebook.
Embedded Posts are a simple way to put public posts - by a Page or a person on Facebook - into the content of your web site or web page. Only public posts from Facebook pages and profiles can be embedded.
The Comments box lets people comment on content on your site using their Facebook profile and shows this activity to their friends in news feed. It also contains built-in moderation tools and special social relevance ranking.