Adding Open Graph Meta Data in WordPress Using Official Facebook Plugin

opengraph support.php

<?php
add_filter('language_attributes', 'aprefix_add_opengraph_doctype');
function aprefix_add_opengraph_doctype( $output ) {
        return $output . ' xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml"';
}
 
add_action( 'wp_head', 'prefix_insert_fb_in_head', 5 );
function prefix_insert_fb_in_head() {
    global $post;
    if ( !is_singular()) //if it is not a post or a page
        return;
        echo '<meta property="fb:admins" content="YOUR USER ID"/>';
        echo '<meta property="og:title" content="' . get_the_title() . '"/>';
        echo '<meta property="og:type" content="article"/>';
        echo '<meta property="og:description" content="'.get_the_excerpt().'"/>';
        echo '<meta property="og:url" content="' . get_permalink() . '"/>';
        echo '<meta property="og:site_name" content="Your Site NAME Goes HERE"/>';
    if(!has_post_thumbnail( $post->ID )) { //the post does not have featured image, use a default image
        $default_image="http://example.com/image.jpg"; //replace this with a default image on your server or an image in your media library
        echo '<meta property="og:image" content="' . $default_image . '"/>';
    } else {
        $thumbnail_src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'medium' );
        echo '<meta property="og:image" content="' . esc_attr( $thumbnail_src[0] ) . '"/>';
    }
    echo "
";
}