Update 2020: Learn more about Twitter Cards: https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/abouts-cards
A new (edit: was new in 2014) product has arrived for your marketing pleasure! Twitter Cards, available in eight flavors, will help you increase engagement and likely conversions.
“Twitter Cards make it possible for you to attach media experiences to Tweets that link to your content. Simply add a few lines of HTML to your webpages, and users who Tweet links to your content will have a “card” added to the Tweet that’s visible to all of their followers.”
The different Card types each have a beautiful consumption experience built for Twitter’s web and mobile clients:
- Summary Card: Title, description, and thumbnail.
- Summary Card with Large Image: Similar to the Summary Card, but with a prominently-featured image.
- App Card: A Card with a direct download to a mobile app.
- Player Card: A Card that can display video/audio/media.
To learn more about how the Card meta tags and web crawler work, check out the Getting Started Guide.
Add the HTML to any page you want to associate a card with — in the head section. If you’re using a CMS like WordPress, Blogger or Tumblr, visit this page and learn more about integrating Twitter Cards with your site. By the way this does include information about WordPress.com sites.