Memoov is an excellent site for digital storytelling similar to My Storymaker. As w/ most sites like this, a person can select a character (edit), add a scene/action, and then add text to create a story. This site is very user friendly and even allows users to record their own voice to add to a character. Once a story is done a person can upload it and share via a URL or watch on a YouTube channel.
I highly recommend giving Memoov a try by clicking here.
I'd like to thank Karen Ogen's blog for the tip!!