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Open Graph Protocol in Posts and Pages (OGP) allows you to add the OG meta tags on a per page basis, or use default settings across the site.

OGP adds an additional meta box to the post and page editing screen for you to enter og: meta values for that post or page

When the post or page is liked or shared on Facebook and other Open Graph sites, the title, description and url along with other items are automatically pulled in from the meta vaues added in the box.