This app was removed from the App Store.
iOS iPhone Social Networking
Twoodles is an app for drawing and embedding small doodles in your tweets. Instead of relying on an external website to host the image, it stays true to the twitter principles and encodes the drawing in fewer than 140 characters. When reading the tweet, Twoodles will automatically render the doodle for you.
Twoodles Viewer is a free version of Twoodles which allows you to view the Twoodle drawings on Twitter, but not create them.