wordpress-twitter card

gistfile1.txt

<meta name="twitter:card" value="summary" />
<meta name="twitter:url" value="<?php echo get_permalink(); ?>" />
<meta name="twitter:title" value="<?php echo get_the_title(); ?>" />
<meta name="twitter:description" value="<?php echo get_the_excerpt(); ?>" />
<meta name="twitter:image" value="<?php echo wp_get_attachment_url( get_post_thumbnail_id() ); ?>" />
<meta name="twitter:site" value="@twitter_account" />
<meta name="twitter:domain" content="your URL"/>
<meta name="twitter:creator" value="@twitter_account" />