Are you sure you copied the code correctly? After making the changes, I get most of the post I expect, but instead of the embedded tweet, I get a blockquote with the text "+document.title+" instead of the tweet text. I was testing this in chrome as well.

I'm suspecting that the code portion about brid.gy uses bridgy to cross-post the like/retweet to Twitter, but without including a URL link back to the permalink of the post on WordPress?