If you’ve activated the Sharing or Jetpack Social modules, Jetpack will automatically add Open Graph meta tags to each one of your posts. These tags are used by Facebook to gather information about the post and build a post preview when one of your readers shares a post on Facebook.
If you already use another plugin to handle Open Graph meta tags on your site, we’ll automatically deactivate Jetpack’s Open Graph meta tags for you, to avoid any duplicates.
If, however, you’ve added these tags to your theme or built your own plugin, you’ll want to add the following code to your theme’s functions.php file or to your plugin, to deactivate Jetpack’s Open Graph meta tags:
add_filter( 'jetpack_enable_open_graph', '__return_false' );
Jetpack 