title: How do I add an image to a tweet or how does twitter decide which image urls to render
body: <p>If I post a tweet with a link to a picture it will only display the link. But if twitpic post an image link (or rather a link to a page with an image) twitter will render the image (smaller albeit). </p>
  
  <p>I know twitter now has <a href="https://dev.twitter.com/docs/tweet-entities">Tweet Entities</a> but those appear to be for reading and not writing. </p>
  
  <p>And yeah I could use twitpic but I rather not since we already have the images saved and ready to go.</p>
  
  <p>Basically how do you become like: twitpic, lockerz, photobucket, yfrog... so on so that twitter recognizes your links as images.</p>
  
  <p><em>Update: I know twitter will provide upload image api soon but I would rather have the image content on my site.</em></p>