Twitter co-founders Evan Williams and Biz Stone are back in the game.

The Obvious Corporation, co-founded by Stone and Williams, on Tuesday launched a new publishing platform, dubbed Medium.

The site's functionality allows users to post photos and text, and read and like (or, actually "love") other people's posts; its modular visual layout resembles Pinterest, however.

Williams says Medium hopes to improve blogging "in terms of layout, design, and clarity of experience."

"We haven't even scratched the surface of what our smart devices and our networks that connect most of the planet might enable," Williams wrote in a Medium blog post. "So, we're re-imagining publishing in an attempt to make an evolutionary lead, based on everything we've learned in the last 13 years and the needs of today's world."

Currently, Medium is only available to select users, but the site is accepting registrations for those interested in using the service in the future. Anyone with a Twitter account can sign in and view posts now, though.

Accompanying each post is a green bull's eye with a score from one to 10 indicating how many viewers voted for the post. Medium's default setting places the highest-rated posts at the top of their page.

For Stone and Williams, a win with Medium would create a trifecta of hits. The pair also worked together on the creation of Web publishing service Blogger in 1999; Williams sold that service to Google in 2003.