Hi @techsou,
I tweeted your URL and see this:
http://imgur.com/m3UbdUs
It appears the Card works. However, there’s not much info. It’s likely because the tags you have don’t have much info:
In particular, for the summary Card fill out the image:src and description tags and try the below URL to refresh the cache and view your updates:
https://dev.twitter.com/docs/cards/troubleshooting#caching