I watched the Evan Williams interview with Jason Calacanis at the Launchfest conference in SF, and that gave me a better idea of what he's thinking about with his new company, Medium. The next day we learned that Evan Hansen is now working for Medium. Evan was the longtime editor of wired.com. Highly respected guy.
What is Medium doing? My guess -- if you were to draw a line and at one end put blogging tools and at the other put BuzzFeed, SB Nation and Huffington, that Medium is on that line, and closer to the right than the left.
Medium's strength appears to be the elegance and HTML 5-ness of its editorial tools. It feels nice using their editor. Like the content networks, being able to create content there is invite-only. But I'm assuming at some point it will be open to everyone, the way Tumblr or WordPress are.
An advantage Medium is likely to have is a connection to Twitter, which doesn't have a blogging system, and has recently had success with Vine. Twitter giving Medium a boost is good business, for the owners of both companies. ;-)
I'm very interested in where all this is going, keeping an ear out and listening.