I've applied for TwitterCards but haven't heard from Twitter since, so when using wp.me shortlinks I found out a preview + image is visible on Twitter.
However, it seems like Twitter doesn't gain the twittercard-information from my meta-tags (valid, I checked) but from wp.me's own:
The excerpt is longer than what I defined in my meta tags and the preview-image is FUBAR... Somehow it chose a 150x84 pixel version for display, then resized it to 440x330.
Very very ugly... I'm using JetPack to publish my posts on Twitter. Any way to fix this?