title: Twitter oauth authorization in a pop-up instead of in main browser window
body: <p>I feel incredibly stupid for even asking this since the answer might already be under my nose but here it goes:</p>
  
  <p>TweetMeme has a Re-tweet twitter widget that publishers can place on their blogs.  When a user clicks on the widget, it pops open a window which allows the user to authenticate themselves with twitter and then re-tweet.</p>
  
  <p>This seems to use some special Twitter oauth popup form factor - unless there is something fancier happening under the surface to authenticate the user.</p>
  
  <p>The pop-up window looks like this:</p>
  
  <p><a href="http://twitpic.com/1kepcr" rel="noreferrer">http://twitpic.com/1kepcr</a></p>
  
  <p>I'd rather handle an authentication via a pop-up rather than send the user to a brand new page (for the app I'm working on) and they seem to have the most graceful solution.  Thoughts on how they did this?</p>