Medium is a popular publishing platform (not a fully-fledged CMS) that aims to connect people with stories and ideas that matter to them. Due to the fact that it isn't shipped with a number of content management tricks - it focuses greatly on being a text editor.
It allows to easily save, share, recommend, and embed the story on other web solutions if required. If the post is great - it can get featured on the front page of the site. Creating a Medium account is a one-click affair with Twitter account. Users don’t have to worry about themes or plugins because there are none.