title: Is there a callback for Twitter's Tweet Button?
body: <p>Is there a way to register a callback on Twitter's Tweet button? I'd like to be able to track which particular users on my site have tweeted a link. I can't add on onClick event because it's a cross-domain iFrame. Any other ideas?</p>
  
  <p>I've seen <a href="https://stackoverflow.com/questions/4092992/how-to-track-tweet-button-clicks">one way to do it</a> but it seems unreliable. <a href="http://dev.twitter.com/pages/tweet_button" rel="noreferrer">Their documentation</a> doesn't mention anything so I am looking for help with a work-around.</p>