You can see Pins on Twitter!
Pinterest has added Twitter Summary Card Support, “The card is designed to give the reader a preview of the content before clicking through to your website.”
A representative for Pinterest has confirmed, “We are currently testing summary cards, but have no further details to share.”
Below is an example of what the Summary Twitter card shows you.
The top is the tweet and when you hit “view summary” ~ you will see a title, description, thumbnail, and Twitter account attribution. It also displays that the content is on Pinterest and can be viewed there.
In December Pinterest tested Twitter Card support making it possible to see the whole photo on Twitter.