"Recently Twitter added ability to attach a photo to tweets, just like StatusNet had before. So the purpose is supporting this feature just like supporting StatusNet feature in Choqok. So, You have an example of whatever you need to do (from GUI to Backend), in Laconica(old name of StatusNet) microblog plugin of Choqok. And here is the API method ref: https://dev.twitter.com/docs/api/1/post/statuses/update_with_media
Prerequisites: KIO library/ knowing XML or JSON / and basic understanding of HTTP methods"