Add Twitter Card markup to individual posts. Supports summary, photo, and player types. This will turn your posts to pretty looking Tweets when you send them to Twitter. They'll stick out much more with a Thumbnail and Description. Generate inline content previews on Twitter.com and Twitter clients by including Twitter Card HTML meta elements for individual posts. All cards are a Twitter Card summary by default. Tap into the twitter_card_properties filter to reference the Twitter accounts of your site or author.