Integrate open graph protocol without plugin?

This information doesn’t have to be static. Here’s an example:

<meta property="og:title" content="<?php if ( is_single() ) { wp_title(); } else { bloginfo('name'); } ?>" />
<meta property="og:type" content="blog" />
<meta property="og:url" content="<?php echo get_permalink() ?>" />
<meta property="og:site_name" content="<?php bloginfo('name') ?>" />

Images are a little tricker. I like using the featured image if it’s available, personally. To do so, add this with your opengraph data:

<?php foreach (get_representative_images() as $image_url): ?>
<meta property="og:image" content="<?php echo $image_url ?>" />
<?php endforeach; ?>

… and add this to your theme’s functions.php…

function get_representative_images() {
    global $post;
    $images = array('http://www.your.com/default/image.jpg');
    if ( has_post_thumbnail($post->ID) ) { // check if the post has a Post Thumbnail assigned to it.
        $image_url = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'thumbnail');
        array_unshift($images, $image_url[0]);
    }
    return $images;
}

Cheers~

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