In a move to make it easier for users to follow their favorite authors and journalists, Facebook has added a new Open Graph tag that lets publishers highlight links to their page or to an author’s Facebook page directly in preview pages.
Once activated, Facebook users who see a post about an author or a book can simply click on the highlighted author or publisher name in order to follow or like them. Publishers simply have to add two lines of code to hyperlink their authors and pages to make this possible. Here is more from the Facebook blog:
article:publisher lets a publisher link an article to their own Facebook page. When the article is shared in News Feed, a “like” button is displayed so people can like the publisher page. article:author lets a publisher link an article to the Facebook profile of the author. When the article is shared in News Feed, a “follow” button is displayed so people can follow the author. The author needs to have Follow activated on his or her profile for this button to appear.