This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
See what your Facebook friends have liked, shared, or commented on across the Web. This includes all variations of Like, Share and Follow Buttons, Embedded Posts, Comments, Activity Feed, Recommendations Feed, Recommendations Bar, Like Box and Facepile.
Open graph description entity tag
Sites who has this tag are verfied by google to use WebMaster tools