The biggest benefit of being on medium is that I can just write some words and push the button and I get a nice-looking web page I can share with my friends. I don't care about google rank or more eyeballs or whatever. But I'd rather focus on writing better words than worrying about the words -> website process. Give me something that's as easy to work with (log in, type stuff in the in-browser editor, push publish - no renting a server or installing ruby or whatever) and looks as good at the end, and I'll happily use that.

That's been around for ages:

http://blogger.com http://wordpress.com

Or self-host wordpress