Whenever I tweet about an item on etsy, it shows this neat preview under the "view photo". I don't even use their tweet button, just cut + paste the url, and it shows up like this:
But when I post a link to my own website, there's no "view photo" thing on twitter, it's just a boring link.
Anyone know what this uses? Is it some secret deal twitter made with etsy, or just some simple code on their site that tells them how to show a preview? I want to do something like this too, and did a bunch of view sources but couldn't find out the secret.