It’s the built in share. We tested the Jetpack shares and they do let the user select an image. But we prefer the look and placement of the built in if we could get the pinterest button to work appropriately. Thanks!
To help clarify the problem…it appears the Pinterest button code just pulls the last image used in a post. It doesn’t allow you to choose from all the images (like in your example template) here: http://supreme.swiftideas.net/2013/02/02/supreme-2013-playlist/
