Referer from Twitter doesn't appear on Getclicky or other web analytics?

I use getclicky for my site.... But I'm just realized that traffic from twitter didn't counted
This also happened with my wordpress.com blog.

I test directly from twitter, I create link to my blog on my tweet, then I go to clicky dashboard, there are have no twitter traffic as referrer.. just blank.
Same also with my wordpress.com blog twitter referrer doesnt count..

am I did something wrong? need your input guys..

thanks