private function get_social_networks()
{
$social_networks = array('opengraph' => $this->social_network('opengraph', __('Facebook', 'wordpress-seo'), sprintf(__('%1$s by %2$s', 'wordpress-seo'), '1200', '630')), 'twitter' => $this->social_network('twitter', __('Twitter', 'wordpress-seo'), sprintf(__('%1$s by %2$s', 'wordpress-seo'), '1024', '512')));
$social_networks = $this->filter_social_networks($social_networks);
return $social_networks;
}