Back in August I tackled the question “What is a card?,” and noted that Twitter is starting to add more interactively rich cards to its platform. Today, Twitter announced that they are rolling out another card type: audio cards, starting with SoundCloud. When any tweet includes a link to SoundCloud content, official Twitter clients will let you play the audio directly within the tweet. On iPhone it looks like this:

If you click directly to the link, you can try it for yourself.

Bit by bit, the web is becoming cardified. By this time next year I expect that cards will be much, much more prevalent, and more capable, too. If this concept is still new to you, be sure to read my primer.