I have added the correct meta information and code to my website. I also verified my markup with the Validator and also applied for approval. My application for Twitter Cards recently got approved. However, the cards do not show up on the Twitter stream.
I also digged around through the forums and tried both — www.domain.com — as well as — domain.com — and both show as approved on the Twitter Card Validator. So I am not sure what the problem is and how come the cards do not work on Twitter.
The website I applied for is: ultimatekorra.blogspot.com
I also use short url services like bitly when I post. I tried a bitly short url on the validator and that works but does not work on Twitter itself I tried the regular url and that also works on the validator but does not work on Twitter.
Example URL from Website: http://www.ultimatekorra.blogspot.com/2013/05/legend-of-korra-season-2-confirmed-for-late-2013.html
SHORT URL of the Same Post: http://korra.us.to/18FZn2W