With Yfrog you have a tool for sharing images on Twitter. The site, which is available in many languages, shows you a box in which you browse the picture and write a message related it. Then you need to write your Twitter's username and the password. That's it, post it and share with the world the amazing things that you have saved thanks to a camera.

Here I leave a link to a review regarding Twitter:

http://hubpages.com/hub/www_twitter_com