The Wayback Machine - https://web.archive.org/web/20160617144608/https://dev.twitter.com/cards/types/summary

Summary Card

The Summary Card can be used for many kinds of web content, from blog posts and news articles, to products and restaurants. It is designed to give the reader a preview of the content before clicking through to your website.

The Tweet below shows a Summary Card (photo and text) below the 140 characters:

Our system recognizes when URLs are included in a tweet, and crawls your site to fetch the Card type and content. To learn more about how our Card system works, read our Getting Started Guide.

Sample Code

Adding a Summary Card to your tweets is as simple as adding the below meta tags to your site:

<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@flickr" />
<meta name="twitter:title" content="Small Island Developing States Photo Submission" />
<meta name="twitter:description" content="View the album on Flickr." />
<meta name="twitter:image" content="https://farm6.staticflickr.com/5510/14338202952_93595258ff_z.jpg" />

Be sure to provide your own site attribution and content.

Once the tags are live, you can test your Card using our Twitter Card Validator.

Reference

Below are the suggested minimum properties for the Summary Card including title, description, and image.

Card PropertyRequired

twitter:card

Should be set to a value of “summary”		Yes

twitter:site

The Twitter @username the card should be attributed to. Required for Twitter Card analytics.

Yes

twitter:title

A concise title for the related content.

Platform specific behaviors:
  • iOS, Android: Truncated to two lines in timeline and expanded Tweet
  • Web: Truncated to one line in timeline and expanded Tweet
Yes

twitter:description

A description that concisely summarizes the content as appropriate for presentation within a Tweet. You should not re-use the title as the description or use this field to describe the general services provided by the website.

Platform specific behaviors:
  • iOS, Android: Not displayed
  • Web: Truncated to three lines in timeline and expanded Tweet
Yes

twitter:image

A URL to a unique image representing the content of the page. You should not use a generic image such as your website logo, author photo, or other image that spans multiple pages.

The image must be a minimum size of 120px by 120px and must be less than 1MB in file size. The image will be cropped to a square on all platforms.		No

twitter:image:alt

A text description of the image conveying the essential nature of an image to users who are visually impaired.		No

For a full list of supported tags, please see the Cards Markup Tag Reference.