Embedded Posts are a way to put public posts – by a Page or a person on Facebook – into the content of your web site or web page.
The embedded post will show any media attached to it, as well as the number of likes, shares, and comments that the post has. Embedding posts will let people using your web site see the same rich information that is shown on Facebook.com, and they will enable people to follow or like content authors or Pages directly from the embed.
To embed a post, first check if the post is public by hovering over the audience selector (you’ll see a globe icon). Only public posts from Facebook Pages and profiles can be embedded.