kmieta on "[Plugin: WordPress SEO by Yoast] Using Featured Image's Thumbnail for Facebook's og:image"

Hi,

i've set thumbnail size to 300x300 and i change line 254 in frontend > class-opengraph.php:

from

$thumb = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), apply_filters( 'wpseo_opengraph_image_size', 'large' ) );

to

$thumb = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), apply_filters( 'wpseo_opengraph_image_size', 'thumbnail' ) );

unfortunately it's does't work...

where i must add function:

// Tell WP SEO to use a larger thumbnail
function sc_opengraph_image_size($size="medium") {
	return "full";
}
add_filter('wpseo_opengraph_image_size','sc_opengraph_image_size',10,1);

?

I have WP 3.5.1, and WordPress SEO 1.4.7