Originally posted on WordPress.com News:
We are happy to announce our new REST Application Programming Interface (API) that lets developers explore, interact, and create great new content with the vast community of sites on the WordPress.com network and, in the near future, Jetpack-enabled sites.
The API gives developers access to posts and comments, as well as the ability to Follow, Like, or Reblog content for users. Other features from WordPress.com, like the daily handpicked content on Freshly Pressed, are also available through the API.
An excellent example of an application that uses the new API is the Windows 8 WordPress.com app, available now.