Get Post's Custom field values with wp_query()

Hi I have a similar problem. I have a
metabox:Social Links
metabox arguments with meta name: social

I have two fields facebook,twitter linked to posts. I can see them and their default values ‘#’ when I create a post. So I assume the set up part works. Now I write a function

$args = array(
        'post_type' => 'post',
        'category_name' => 'directors',
        'orderby'=> 'id',
        'posts_per_page' => 1,
        'order' => 'asc'
    );

$post_query = new WP_Query($args);
    if($post_query->have_posts() ) {

    while($post_query->have_posts() ) : $post_query->the_post();
 $social = get_post_meta( get_the_ID(), 'social', true );
    foreach ($social as $link) {
                echo $link['facebook'] . '<br/>';
                echo $link['twitter'] . '<br/>';
            }
    endwhile;

}

The function echos nothing when called. I am not sure where I went wrong

https://www.ads-software.com/plugins/wck-custom-fields-and-custom-post-types-creator/