A small feature this one, but one that is incredibly important for a content platform. The titles of your stories now determine the content of the URLs!
A couple of the immediate benefits story tellers get from title based links is it helps give others context when you share stories, it also makes it easier to find in a browser's history.
As mentioned, small feature but meaningful.
Your old URLs still exist and all new content will be served from them. One day we might add a redirect to the latest URL but, for now, we keep the history of your links and show only the latest version of your story.
The URL is now based on the title of your story so there isn't a way to customise it. If you would like to have a custom URL are forwarding services that may help.
Story Time doesn't go through the history of your stories to create new URLs but a quick edit then save will create the new URL for you. All new stories will have friendly URLs.