Twitter Tweet Button does not count

Question

I am using the official Tweet Button from Twitter to allow users to share my site.

The button itself is working just fine, however the counter doesn\'t work and stays at

Answer 1

I had this problem too and found out that it was related to the value of the "canonical" link tag I had set. It was set to http:// www.iphone4simulator.com but tweet button was sharing http://iphone4simulator.com because I had set my DNS servers to remove www string from the address. As soon as I changed the canonical URL value in the markup to the latter, the button worked like a charm!